I'm in this camp. I think the guys that are rent-a-players will go make some serious money in this new league and develop for the NBA draft, in turn opening the door for more (albeit less talented) players.
Let's say the top 40-50 guys every single year go this route (which is probably significantly too high). That should even out talent (more than it is today anyway), because after you get past those top guys, the difference between guy 51 and 200 isn't all that great. The UNC's, UK's, KU's etc. that load up on the cream of the crop, will likely still bring in the "top guys," but those top players aren't at a level so far above the next tier of players below them, which should in theory, make for more competitive games.
I foresee this bringing more stability & continuity to programs around the country. If it does, and those guys stick around 2 or 3, or even 4 years, then the next wave of recruits coming in, may filter more outside of the blue bloods. I also believe we'll see more competition, and not the same handful of schools making their way to the FF and national title games. Overall, I think it will make for a better product, less roster turnover. The more stability & familiarity a team has, the better the basketball will be.
I'd rather watch a group of slightly lesser players, who have played together for a few years than a handful of one and dones trying to figure out how to play together for 2/3's of a season before gelling. Personally, I would find that to be a better brand of basketball to watch than what is out there today.