I think this will be worse. Snapchat isn't nearly as culturally sticky as Twitter. Sites like Twitter, Instagram, and Facebook have a robust friend/follower system, and users have a huge backlog of things they contributed to the platforms. No contributions on Snapchat last more than a single day, so what is motivating users to stay on the platform instead of using Facebook or Instagram's offerings? Their friends lists exist both of those places too. In 10 years we'll look back on Snapchat as a flash in the pan.
I think Snap has potential to be huge… anything that wins the race to replace TV is going to be big. Whether they can do it before FB clones them/leverages their network is a big open question.
That said, despite the fact that I love Twitter more than any other network, almost none of my friends use it maybe ~a dozen people I know closely in real life still post to it. Almost all of my friends use Snapchat and complain about my lack of engagement with it.
Anecdotal, but I don't think they are comparable… additionally if your (likely closer nit group of vs. FB's "everyone you know") friends aren't posting, brands are putting up a TON that people seem to really like.
Neither does anyone an hour watching TV anymore? Everyone within the age range 18-30 in the US definitely spends more time on Snapchat than TV right now.