I'm not too upset that Bethesda are the ones doing it.
Black Isle lost a ton of talent even before Fallout 2 was made, then even more afterwards, and frankly, I was beginning to dread the idea of another Fallout game.
Troika is a company I wouldn't mind doing it, but I think it's pretty clear by not that they can go wrong... Arcanum was good (especially patched) but very flawed in certain ways, and ToEE had a good turn-based 3.5 engine, and little else. I'm kind of anxious to see how their Vampire game turns out, because I do want them to suceed.
All in all, someone new taking a stab at it might actually be a good idea... My biggest concern is not turn-based combat, but whether they keep a strong story and the ability to interact with a lot of unique NPCs, and - most importantly - whether they go back to the post-apocalyptic basics, because Fallout 2 was just too high tech, polished and overpopulated for my taste. I want a game in which it feels like it matters when you finally get a working gun and a decent amount of ammo, instead of tripping over automatic and energy weapons.