> I can’t imagine people will start paying for email, search, music streaming...
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.