Tremonti may be very talented, but that doesn't mean that the world isn't full of other talented people. If Stapp is going in a different direction musically, I'm guessing that he probably would be interested in working with someone whose style fits in with the direction......so no....he probably won't be missing Tremonti.
I get in moods sometimes and like to listen to blues guitarists....BB King, Stevie Ray Vaughn.....one of my favorites...Jonny Lang....released his first record when he was just 16 years old. There are plenty of talented people...just talented in different ways.