I completely support the idea of MMC 3.0 and if we can come to an understanding, I will join the development team. I do have some suggestions you may wish to consider.
1) start a new chain , altcoins are different from BTC in that once an alt becomes settled, forking it leaves many behind.
2) (if I am part of this) let's really pull together some communities, instead of MMC and NRS only, lets have a larger sharebase. Those who wish to participate should burn their existing coins on their respective chains and will be allocated in MMC 3.0
3) if 2 is done, lets use a different name.
4) maybe consider BTSX as a model, I hear good things about DPoS