My only issue with this idea is that the NBA draft is currently only 2 rounds. The TV coverage, if both rounds are now split over a period of 2 days, will be lackluster at best.
This works for the NFL, for example, because the NFL draft is more than 2 rounds, so it makes sense to hold that draft over multiple days, as opposed to trying to squeeze all rounds into a single day, and causing mass chaos.
I just don't see how the NBA draft will be any better when held over multiple days, especially if the current format is going to be kept. Increase the number of rounds, and maybe I'll be more excited about it. But, as it currently stands, I can't see this working.