Alright, got it. Sorry, I misunderstood a few things.
Yes, I'm still considering this. Having my bicuspids pulled (4) made my once nonexistent jaw joints problems not so good. My thought was to try and undo that process. I got the impression that things can go really wrong because that's just how stuff like this works. I don't mean that in a bad way or in a negative way; it's just the reality of stuff like this. Hell, it's the reality of medical treatment in general. I don't think it means don't do it, I would just expect some degree of issue. You just hope that the benefit is bigger than the cost (cost/benefit, risk/reward).
It's a fact that moving teeth that much (to reopen extraction spaces or whatever) is really hard on both your teeth and gums. It's a fact that braces alone are hard on the teeth and gums of adults. It's also true that implants and crowns don't last forever, and that implants can fail. Also, sometimes implants need bone grafting done, too.
Again, I don't mean this in a bad way. Like I mentioned, this is something I'm still considering as I really believe it makes a ton of sense for the right patient. I'm just a realist, and fully expect s**t to happen, and prefer to see that s**t coming before it gets to me and I'm left surprised. That's all.
Cheers! Best of luck with whatever you choose!