Depends on how they design it and how much better they can leverage technology.  I have that concern too though.  I think it probably COULD all fit but it could also go very wrong.

I think they need way more kiosks, and way better bag-drop capability.  I'm perfectly happy checking in online at home and/or by kiosk at the airport, but then it makes no sense just to have to get into the long lines anyway to simply drop off the bag.  That's the biggest problem with the check-in process at DIA now.  Hell, the bag-drop lines are often longer than the "full service" lines.  

They really need a bunch of automated bag-drop machines at DIA.