The chances of us doing anything larger than ten man UBRS-style raids are quite slim. This is something that's always been a problem and a source of discontent in CLOWN-in-WoW, and most have either left the guild to pursue endgame like you suggest, have quit WoW or have come to terms with it in other ways.
If you want to play endgame in a CLOWNy sort of way I'd probably recommend taking a look at the
Missing in Action thread and seeing where the other endgame CLOWNs have gone. Most are in CotH but I hear they may be full. There are other CLOWNs scattered around though in other less full guilds.
Make sure you join channel pie as pretty much everyone is on that and from what I have seen have been quite willing to help each other recently.
Also this is the general CLOWN forum not the Warcraft one so some people may not have a clue what we're talking about