I think the time is now for another Marvel/DC Crossover. It's been forever since we had one of those.
This is likely not a popular opinion, but other than Amalgam has anyone really liked the Marvel/DC crossovers?
They always struck me as cheesy. I quite like Busiek (Astro City is an all time great, and Marvels is great) and obviously Perez is great, but JLA/Avengers seemed so underwhelming as it was obvious that they had to make both companies happy in keeping their characters looking strong. Previous crossovers like Superman/Spiderman and Superman/Thor from the 70s or early 80s were similarly by the numbers.
A good crossover would be interesting, but another one that does more to show how cookie cutter similar most heroes are with their counterparts in the other company doesn't really appeal to me.
Edit: Nothing like getting the top of a page for an opinion that's likely to be unpopular.