Marco's a lot of fun to watch, but when Wilson played in Tampa last time (and Marco couldn't make it), I didn't really miss him. Guthrie is a different story altogether, though. In the end it's Steven's show so I'm sure he'll find someone good.
Also, I know I'm in the great minority when I say this but to voice the unpopular opinion, I absolutely loathe Raider II. For me, it's easy one of his worst songs he's ever written and I find it a bloated, dull mess. I'm not ashamed to say that both times I saw him tour and he inevitably played it, I found it a good time to hit the bathroom and check my messages.