If they do it as a separate game, like Tekken Tag was for Tekken, then it should be OK. There have been a junk load of characters created to suffice for a second MKT, as long as they do it right.
MKD with all the DA characters and some extras, plus a tagteam mode. theres a good MKT2. if not, its probably gunna be far later. it would see mto make sense tho, since they just finished the second trilogy.