The internet has been lowering the differences between the privileged and less privileged learners. And that means not only the economical privilege (despite that one being definitely one of the most important and most widely spread ones) but also geographical (good luck trying to learn Portuguese as a native Czech without the internet, you'll end at weak B1 at best, that's just one of many examples), social (the internet is the way to break the myths and nonsense people around you think and impose on you, when you simply don't have the privilege of living in a more enlightened community), and even health or family situation related ones (not everyone can simply leave their house for two evenings per week to go to classes somewhere).
Yes, you are right that technologies need to be taken with the negative sides on mind too. But the positive ones outweight that.
Simply put: without the technologies, the internet, and everything that came with it, I would be nowhere near where I am now in my languages and life.
I am not Amish. I do not find their choice foolish and I wish them happiness (and only hope that every young Amish gets an opportunity to choose whether to follow the same path). I admire their courage to stick with their beliefs despite all the discomfort. But I do not want to live like one.
And I do not want to live like a typical Czech either and I would have to without technologies and my languages. You might find a lot of sympathisers here, when it comes to technologies criticism, conspiracy theories, and such stuff. But (unlike you of course) they are usually uneducated, poor, easily manipulated by politicians and anyone else, envious, and without any hope for a better life. I do not want to be like them and education WITH the use of modern technologies is the only way to avoid such a fate.
I do not know a single person of my generation that would have really good education and be successful and happy without using the internet a lot. It is in some ways sad but it is the truth. I don't know a single really successful language learner who wouldn't either use the internet based resources (either primarily learning tools or at least movies) or be privileged enough to have studied at least one semester abroad.
I’m certain many language learners advanced rather effectively pre mobile devices, pre internet and without travelling. But yes increased access today does help, but good things are not always good things.
Yeah? Which ones? What do you mean rather effectively?
No offence meant, but I don't think you have a clue. The generation of my parents should have been learning languages rather effectively, without access to foreign media, with one or two coursebooks for general public per language (and not ever language) on the market, with barbed wire and dogs around the borders, shouldn't it? You've got a perfect sample for this thought experiment of yours here. Well, they were monolingual. Those who were "successful learners" were at most A2/B1 by today's standards. Sure, there were people with language degrees working as translators with the skills, there were people with the experience of abroad stays, but those were really a selected group of people cooperating with the regime on various levels, not just someone who wanted to learn a language.
And even after the fall of communism. I am a 90's child. And I remember it damn well, I remember the beginning of the millennium too, and the progressive spread and growth of the internet. Because I was a weird child that decided to learn French in those days, when I should have been "advancing rather effectively" as you say, that's why I remember. Can you imagine how poor the language learning shelves in the bookstores and libraries were? How expensive everything was, simply because there was no cheaper online alternative or an eshop competing with the normal stores? Can you imagine that a very crappy course was considered awesome just because it was the only modern looking one on the market and everyone was blaming themselves or the language for failure instead? That the selection of foreign books in a library was rather poor and you definitely couldn't have afforded a luxury like having your own taste? That the only way to get listening exposure was buying the cassettes (or newly cds) that were twice or thrice as expensive as the corresponding coursebook? Or how dependent on the teacher you were and how damned you were, if they simply sucked? How pointless it all seemed to be, as the paid lessons with a teacher were not only the way to learn a language but also the only use you were likely to ever have for the language?
Sure, there were successful learners even in the 17th century or in the 4th century B.C. but not people like you and me.
Yes, there are clear risks of the technologies and problems, but I wouldn't trade them for the hopeless ignorant world before.
I'm pretty sure my grandfather had the same complaint about the Beatles, and while I had the Beatles, I chose Nirvana and the Pixies. Each generation will listen to what speaks to them or create something that does. 
