Besides Hollywood not wanting to risk a dime on this loon in the future... Maybe, just maybe, Hollywood will realize that betting the farm on these idiot wierdos is not such a good business proposition. After M:I:III bombs this summer, and Battlefield: Earth was such a disaster, producers might start to shy away from Scientology projects that just can't be sold to the masses.
Can't happen soon enough, IMHO. These people richly deserve obscurity.
You might be right that this is the deathknell for Cruise's career. Michael Jackson saw his album sales go into the crapper after the first rumors of child molestation started, and he got weirder and weirder. Travolta's fortunes have gone downhill since Battlefield: Earth turned out to be the biggest bomb since Heaven's Gate. The public doesn't go for wierd.