I can't see just kicking your kids out simply because they don't want to live the JW lifestyle. But this shouldn't be confused with enabling your kids to live unhealthy lifestyles. Or to take having your home for granted, just being lazy. Life is tougher these days, it's true, but they should carry their own load in life if they are to ever grow up into responsible adults.
I still hold marriage in high regard, for example. No, I will not provide a bed for one night stands or things that don't meet my own standards of decency. But I would help them in their apartment search, job search, career search or education, with some time limit attached. Communicating with them as adults about this might help them to get a glimpse of maturity.
None of my kids stayed in the religion. We all have good relationships. They are all on their own and each doing well in their choices. You have to consider your own tolerance level and they should respect that.