By play I'm going to assume you mean Gamemaster.
Sadly, there are very few GMs in my gaming circles interested in and willing to run the games I want to play in and fewer still who run them well.
Now before anyone gets a burr in their boots, I am not saying that there aren't a lot of very talented GMs around my way. In fact I know a few really great ones. Unfortunately for me personally, most of these guys don't have much of an inclination to run the games I wish I could play in. Those that do, well, the execution is kind of hit and miss.
I'd love to play Star Trek as a player again. I love Star Trek, I love running it and I definitely like playing it. Star Wars, oh man, that would also be a ton of fun. Giant Robots! Damn. I haven't played in a Mecha game in so long I barely remember when the last time was.
Ars Magica with a Folklore flair, Faery's Tale Deluxe, Golden Sky Stories, Ghostbusters, Hunter Planet, Men in Black, Paranoia, Gold and Silver Age Superheroes (especially pre-Crisis on Infinite Earths DC Comics), Teenagers from Outer Space, Toon, or even classic Traveller...if I don't run these they don't get ran.
Now I'm depressed.
Which game do I hope to play again?
Anything but the same old thing.