See above link #3 to what our Senators are proposing (make the Guard into a long term security force)Politicions are notorious for having bad ideas. It would be legitimate for them to stay as long as we need them to provide for our security in this crisis, IMO.
This will not be a long term. The idea will be defeated, IMO.
I have seen some estimates of this conflict taking up to 10 years (just look at how long Israel or the Russians have been battling terrorists for starters)