I really don't see the point of this. The main problem is that such Pokemon as Kyogre are significantly more powerful than, say, Latias or Manaphy, meaning that in order to have a balanced metagame (which is apparently not a concern to you) some Pokemon must be banned from this new Standard. This would either give an insanely small new Ubers tier or result in almost every Pokemon from classic Ubers being rebanned if their individual levels of power are too widespread to hit a "balanced" tier of Pokemon with around equal levels of power, like the top of our current OU. Now, let's consider what the new UU would look like, should this be undertaken and all the Ubers avoid being banned. We would have an OU tier of about 30 Pokemon, as you said, but all of them would be utility Pokemon such as Blissey, Scizor, and so on, with a couple of interesting Swift Swimmers and Chlorophyll users. Because of the definition of OU, that would mean Blissey, Scizor, etc. would be banned from UU play. This leaves significantly reduced Special walling and revenge killing opportunities in UU, making many sweepers much more powerful, and quite possibly BL. Suddenly, we have a rapidly growing BL tier of Pokemon unusable in OU (because they are sweepers that can't match the high OUs) and overpowered in UU. I won't even begin to conjecture what will happen to a Chanseyless NU (Happiny? I hope not). This makes for a huge spread of Pokemon that are literally unusable, and does much worse to the metagames than losing 23 fucking Pokemon from OU and one from NU.
The point of Ubers is to be the banlist of OU and the "broken" tier. It's a very interesting tier, but has about as much place as the "standard" metagame as NU does. If you want more people to play Ubers, then set up some events. Don't try to break the entire competitive Pokemon scene just so that you can play against someone the second you hit that "find match" button on Shoddy.
The point of Ubers is to be the banlist of OU and the "broken" tier. It's a very interesting tier, but has about as much place as the "standard" metagame as NU does. If you want more people to play Ubers, then set up some events. Don't try to break the entire competitive Pokemon scene just so that you can play against someone the second you hit that "find match" button on Shoddy.