CW has come and gone, and I can't see what hope any villain or villain group has against 50s states, each with its own super hero team, especially when the, say, Montana and North Dakota teams may fly over to help the South Dakota team against the Mandrill, Nekra, and the Black Talon. And that sort of aid becomes yawningly routine throughout the MU.
CW has come and gone, and left a lot of hero-team building to do, but once that's done, who will be able to stand against SHIELD, the Initiative, etc?
Where is there for the drama and the action in the MU to go?
There's only so many Doctor Dooms and Red Skulls to go around; Kang is 'dead,' the Mandarin is dead, Annihilus is dead, Magento is dead (or not dead), Loki is dead, the Leader we haven't seen in some time....and Galactus and/or the Celestials can't drop down from the sky every other day to provide the heroes with a reason for being.
And let's face it: even if the Mandarin, Mr. Sinister, Doctor Doom, and the Leader teamed up for a massive attack, what could they possibly do that 500 or more heroes couldn't stop or control in some way?
So it may be that now that CW has boosted sales, it's on to the next Big Event, whether it makes sense, is any good, or not. CW has boxed writers into a tight corner.
And retooling SM in such a manner would bring in huge sales and media coverage...and after the Death of Cap, I'm sure Marvel Brass and stockholders are clamoring for 'more of that, more of that.'
I can't see the point of sending Cap back to the 40s, since that would keep him out of the MU Proper in the present, but they may have some justification for doing so, rational or not.