"The 10,000 people on the planet that care about Web Sockets are not your customers, and while using Web Sockets might get you mentioned on TechCrunch, supporting only Web Sockets is a great way to cut your potential audience in half."
But it all depends on who you're looking to as your market. I'd go as far to say that the group of people who DON'T support web sockets is exponentially bigger than the ones who do...
As PG has said more than once, it's better to make a small group insanely happy than to make everyone "meh" about your stuff. The geek side of me is really happy to see long polling finally getting thrown out the window like the hack that it is, and if you want to make a stand against it, I'll love you more for it.
Pragmatically, though, you probably want to eventually have a fallback mode in this case, with a note telling people that they should probably use a better browser. Team apps are one of those least common denominator problems, after all.
"The 10,000 people on the planet that care about Web Sockets are not your customers, and while using Web Sockets might get you mentioned on TechCrunch, supporting only Web Sockets is a great way to cut your potential audience in half."
But it all depends on who you're looking to as your market. I'd go as far to say that the group of people who DON'T support web sockets is exponentially bigger than the ones who do...