I believe there were plans to get to this at some point.
You have to understand those missions were written for retail and that's pretty much all you had to work with to make them more difficult. People played the missions so much that everyone was playing on insane and still the missions were too easy. Coming up with innovative ways to make missions hard often met with severe bugs and crashes. Plus if you followed
rules for getting missions validated you had to stay with basic simple mission goals. Pretty much if you had more then 2 goals and a bonus you were considered crazy and you mission probably would never work.
Anyway if there is going to be some sort of project like this the primary goal should be to preserve the existing missions and make sure they work. If they aren't finished and a finished version can't be located finish them. This should especially hold true for any of the originally validated mission packs. Now if people want to make advanced and pretty versions then give them a new name so the originals are still playable the way they were.
Also there are some missions that are validated that should probably not be. So those should either be fixed or removed from the validation pool until they can be.
So basically we need to come up with a valid mission set at some point as well as fix not working missions so they can join that set. There will also need to be a subset of valid TvT missions for squadwar.