Also there's the question of how to package content rigged for a hypothetical new system - don't expect many content makers to be eager to do dramatically more rigging work (current system as well as any future weightmapped system) and charge the same prices.  I'd expect the great majority of content makers will simply pick one system rather than try to support both, probably the newest, which means pretty much those that don't buy into all the new tools required will not be getting much content to use.

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