Not even half of everything needs to be collected, especially in high quality masterworks. From an historical perspective I can see understand the desire for archiving all of the GA and SA comics but that doesn't necessarily mean there is enough of a market for all of it. They could print all of the Romance and Western comics in Essentials and I bet it still wouldn't sell well enough to support the printings.

Even with my love for the 70s era comics I don't think there is much need to print any more in MMW unless perhaps it's Luke Cage. They could do Peter Parker, SVTU, MS. Marvel and others in TPB and it would be just fine with me. As far as the current open titles I think it's worth going up to a good stop point between 1980 - 1983 but after that my guess is the demand for TPB of the material may take over. I'm thinking the Epic Line will grow gradually and eventually surpass MMWs for the 80s material.