In the short term, you are likely right. But do you remember the days when some folks thought society might not need anything more than CompuServe, prodigy, earthling.net, aol? Long term I am hopeful about decentralization.
I'd definitely like to think so - and in practice, I've done more of running my own infrastructure recently. But what about those who're stuck under capped internet plans? What about the people whose interest in computing begins and ends with owning a smartphone?
At the moment, just an old desktop running HTTP/SSH/IRC functionality, and a 1U server I have modified for fitting full size (as in like, the huge, foot-long) PCI cards; mostly for the goofy projects I do in my spare time. It is a hardened machine though, and should be capable of running a few daemons if it comes down to it.
EDIT: I should mention I'm on satellite internet (there's quite literally no options for broadband where I live. I will, however, use my phone line for SSH via dial-up occasionally), so it's probably not very practical to run SMTP. For that, I have a Fastmail account.