I disagree concerning inwz grid. imho, inwz and sl will become niche places for some ppl as the rest of the metaverse uses physics and code that are standardized. For one example, those content creators who wish to sell in several grids and use scripted items, will find an increasingly larger market outside of those two. As the specific necessities of scripting become further apart, this will become increasingly obvious.
Forward thinking people are already seeing this and optimizing their scripting for the increasingly larger metaverse...or, they will be left behind, or, relegated to one grid [which some may find is good enough].