Its a fad with many many 1 and done depositors. As long as its availible on the internet there will be more players than the old backroom games but IMO its already peaked. The only thing i see that could bring another rush of players would be the U.S. govt ANNOUNCING its legal. As long as its in this "grey" area there are a number of people who just are not going to try it...ive had a number of people in the last few months also who asked me how to get into it online then the next time i see them they say "that place you told me about wanted me to send my money to costa rica, gibralter, etc! no way im doing that"....so there is still an untapped market but without the govt telling them its okay (and god only knows how they could possibly think that makes it more safe) i dont see them playing any time soon.
Also tex holdem is a very weird game...it looks INCREDIBLY easy on tv etc but when they get there and take some of the bad beats they throw in the towel very quickly.... it maybe some years before we see less than 2000 people entering the wsop again but i doubt you'll find 50,000 players a night on party poker 2 years from now