Make all preparations required to get out and keep your cards close to your vest - things can change in 3.5 years.
As you get closer to the end of your commitment, if you're still looking at a joystick for the remainder of your AF career, I'd line up the Guard job and bail. I doubt the airlines/freight companies will ever consider RPA time for their hiring mins.
You could pursue a full time AGR slot in the Guard. If that's not available, depending on the ops tempo, you might be able to almost fly full time for a while to build hours and get competitive for an airline job. Either way, the Guard is a great place to do what you joined the AF for, which is fly airplanes.
Yes, many factors point to a hiring boom soon. Will it still be going on in 3.5 years (plus however long it takes you to re-train and get enough PIC hours to be competitive)? Maybe. Should you "bet on" anything related to a civilian airline career? Never.
Good Luck.