With this amount of 'work factor' put on finding / stymying him, it's only a matter of time (and potentially unfortunately, lives). Look at the work factor placed on the DC sniper: Besides everyone being on the lookout, you had classified military flying assets enlisted... ultimately being spotted by an alert truck driver. It's just a matter of time.
Only if he's smart, he'll do what it sounds like he was trying to do, escape and lay low,strike again another day. The only reason the D.C. shooters got caught is because they didn't know when to quit.