Ultra and WMC are not associated technically.
Ultra is run by the fine folks at D'VOX, and Coolworld handles some promotions...they hold it during WMC to make it easier to get the talent gathered. The WMC organization itself has nothing to do with Ultra.
As for WMC moving to vegas, I'd hardly call it serious. Every year, the rumour surfaces that WMC is gonna move to Vegas...it's been a rumour for the past decade almost.
A little known factoid about WMC is that the parties you go to are more than likely not sanctioned by the WMC folks themselves. The record labels, DJs, booking agencies, clubs, and so forth are the ones throwing the parties, they kinda grew up around the original WMC...WMC sanctioned parties are rare...maybe one a day if that.
The WMC itself could move, but it wouldn't make a damn bit of difference. The parties would still go on, and the WMC itself would fade away...seriously, nobody goes to the WMC itself anymore. Even the conference part is supplanted by gear manufacturers, lables, and booking agencies holding free how-tos, discussions, and so forth.
To put it bluntly, if you buy a WMC badge, you're wasting your money. The WMC itself stays in Miami since it knows it's the only chance of survival it has. It leaves, the parties stay, the WMC dies....
Besides, Miami is used to the WMC crowd now...Vegas'd be like "what?" and there'd be a huge to-do about it...
Think about it...Miami has:
-the best clubs in the country (Space 34, crobar, level, maze, nerve, crobar downtown <---ask me about that one)
-the weather, this year was an exception, but it's normally low 80s, little humidity, ocean breezes.
-cheap flights from Europe...very important
-cheap flights from most US points of origin
-cheap flights from South America
-cheap other things from South America
-18 years experience with WMC, the authorities know how to handle it.
-Downtown Miami clubs have a 24 hour operating license...Space 34 practically did not shut down for five days.
-a younger population base...the old crusty Jews largely fled to Fort Lauderdale 10 years ago.
What does Vegas have? Brothels and gambling....and in Miami, both are tolerated...gambling boats, and escort services being the local equivalent.
The flap about Ultra last year was the Miami mayor grandstanding for a minority voting segment...the issue has been settled.
I'm prepared to draw diagrams if necessary.