RE: any benefits to DVD for a two tier system, I think they could make more money overall. If an owner of SSR wants a week in a 2bd at BCV now during mid-season it's around 350 points. If SSR was in a different tier, they could charge say, 600 points and then have that many to rent out through CRO. Also, they could charge higher fees at the first tier resorts and give "benefits" as compensation. I could see giving first tier resort owners a better booking window, or priority for trading out to DCL or similar. I also wonder how many waitlists are for people trying to get into BCV and BLT. I'll bet it's a large percentage. It would unclog the system a bit.
The problem with the CRO theory is that based on that exchange rate you would then give BCV and BLT owners substantially more vacations at SSR which uses up rooms they may want to use for upgrades to free up cheaper resorts. The demand for cheap rooms will always be higher than the villas so even if there is more money to be made it may not be enough to be worth doing it.
I don't think DVD cares even a little about unclogging the waitlists.
A two-tiered system based on what we have now would alienate owners, flood the resale market, and potentially end in a class action lawsuit.