I can't see why prices on a lot of loose and MOC won't at least double over the next 10 years, the common stuff maybe not so much.
But like a lot of people have already mentioned lately there's a lot of value in MOC's at the moment too, some loose figures aren't actually too far away from what a MOC costs. Take Lumat for example, loose, complete & mint you're looking at about £50, but MOC in decent condition iv'e seen go for like £80 a couple of times, just an extra £30 for an untouched sealed one on nice condition card?, there's great value there. And a loose AT-ST driver mint & complete £35 - £40, yet MOC you can pick up for about £60+
I think MOC especially has a much longer way to go yet when more and more collectors start taking advantage of carded figure prices, I can possibly see MOC values rising more than what loose will over the next few years.
You don't own your toys, you only borrow them until you sell them or die!