I believe BAC only applies to Locus Amoenus. We'd have to amend the covenants of all sims to apply to new construction i think.
I don't have a problem with texture requirements for facades or even exterior walls being no mod. I beleive we have the model for this in the Cardo Plots across from the Amphitheater. The street facing facade is no mod, but the interiors can be remodeled to suit usage.
As for prims, if we were ever out of land for sale, this might make sense. But we have prim lots that are not sold, and i dont' believe we've ever been sold out of prim lots. What people seem to really want is more prims for no more money. And well, this is Second life. Not sure that's even reasonable to consider.As it is, we already have a square meter restriction on the number of parcels anyone can own as well as a limit on how many one can own inside the walls. I'm sure the plan was that many small merchants with just a vendor or two would create a busy roman marketplace, but that kind of commercial district really requires there to be something active going on. Traditionally, Colonia Nova has been a bit sleepy.
And remember too, that what we offer with land ownership that is of most value is citizenship in the political community. MANY people own those small parcels only for that,and have no interest in conducting commercial activities. A law allowing non-citizen rentals might serve them well.