These call ups are "expensive" in the short term. There is no will to take regulars from Korea and Germany. Also, increasing the size the army and Marines a few or more active divisions is a long term cost - which would require taking money out of Star Wars and other lucrative techy stuff whose industries return big bucks as political contributions.
I strongly suspect that you are wrong about Korea and Germany. We have already decided to pull the 2nd ID away from the DMZ towards locations south of the Han. I don't think you'll see U.S. troops in Krautland for much longer, either. No strategic need for them, although Rhein-Main is a nice base. A lot of U.S. assets will be returning to CONUS over the next five years from Europe, as the sham alliance known as NATO begins to wither away.
One of the things you will see in a second Bush term is an increase in end-strength of the leg infantry. The war aganst AQ is an intelligence war, but there are times when, as in the Northwestern Frontier states, maneuver battalions of leg infantry will be able to pin and destroy Al Qaeda personnel.
We may also have to deal with the Iranians over the next couple of years. The mullahs have chosen to cast their lot with AQ, and there will have to be consequences for that.
It's an expensive war. I'm not surprised that they are thinking of going the IRR, at least for "codger companies".
Be Seeing You,
Chris