Bethesda can optimize their engine to actually make it stable to increase UGrids
As modders will get the same tools as the devs, if the devs wont optimize it maybe the modders can?
We get access to the "Data", not access to the "Core Engine"... That requires source-code, and removal from the Steam Umbilical-cord. Not something they are willing to surrender to the public.
However, we can fix all the poorly optimized scripts, and objects, which are causing some of the uGrids limitations. But the game is designed around that setting, and not intended to be changed.
To get more detail, we have to shrink the player-size and world-scale, so 5 grids in the world are equal to the size of 7. (Easy-enough to do once the creation kit comes-out.) The result will be less land detail and texture over-sizing, and lots of floating objects that have to be hand-moved back onto the ground. As if there are not enough floating things in the game already!