Q u o t e: 98 to 99 takes 50 or 60 Baal runs, so basically a respecc costing 50 or 60 Baal runs is as reasonable as you can get in this idea.
Ha! I'm not sure if this was a joke or not actually. Leveling from 98 to 99 via Baal runs requires about 4,250 runs, actually. I don't think respec'ing is worth the hassle of doing ~4,000 more Baal runs, personally. I'd rather make a new character from scratch and level him to 90.
I wouldn't mind this idea quite as much if monster levels were changed in various places of the game. Forget about capping area levels at 85. They need to have level 95+ area levels so higher level characters can actually get some noticeable amount of experience. With any luck, this new patch might bring that though. :)