A couple of things wrong with that...
The vast majority of the community doesn't have Vista, and is much more interested in DM than Race. The intention of the devs has always been to create a mod with foot and weapon sync, so there is absolutely no chance they will stop DM to further develop Race. It is really quite a ridiculous suggestion, especially since they have already spent months of work on Deathmatch.
The other thing you're missing is that MTA:DM will be far different from SA-MP, and that everything in Race will be possible in DM using scripts.