Maybe with time there can be a shift in the economics, but I would not bet on it. I can’t imagine people will start paying for email, search, music streaming...
I will definitely miss the ridiculous TC fueled by the ad-laden web, but at least maybe I won’t work alongside physics and math phds on optimizing clicks....
There's absolutely now reason why these services can't all fit in a 5-10$/month allowance. E-mail is already ~2$/month with Office 365, and if everyone starts paying economies of scale would make even cheaper plans profitable.
Some of these services can just as well be provided by the ISP, like e-mail was back in the days. A lot of ISPs are indeed scum but there isn't technically anything forcing the users to use them (you can pay for a third-party) and I think the move away from e-mail being centralized around a few giants like Google (GMail), Microsoft (Outlook), etc would be a good thing.
By comparison, paid services would cost $30/month. You might be willing to pay that, but many will not. People already share Netflix accounts or bootleg their friend’s HBO accounts.
I think a shift to paid services is _possible_ but I won’t bet on it. The economics and market forces that brought us metered data and text usage haven’t really changed. Destroying the advertising-supported offerings will not spawn competition overnight. But in any case I think the big players are positioned to weather the changes.
And by the way, $30/month/user is an average. If you are have high disposable income you are likely netting FB et al more than that.