Yeah, I'd considered that Aaron....but see these problems with that approach:
1. The saw head travels 20' on it's rail....so you'd have to have that much hose that would also stay out of the way.
I suppose one could rig up an articulating overhead arm, like a car wash has for their hose to solve that....but you'd be looking at 40' or more of hose by the time its done.
2. From my experience with my shop dust collector (3hp--17" fan), it would take a LOT of horsepower to pick up green dust, suck it UP, and blow it out. I worked at a local big mill for a while...their dust blower has 100hp motor on it, but they also have some small conveyors that do dust removal with small motors. Sure, their dust is WAY more than I'd produce, but it got me convinced conveying beat blowing. I doubt there is an electric leaf blower that would come close to doing the job. The conveyor only requires a 1/2hp motor to run.
3. Good % of the dust/bark/etc falls on the floor anyway, so vac on the saw wouldn't pick that up.
4. You'd have to run it all the time the saw is running. My plan for the floor mounted conveyor is only run it once or twice a day for the length of time it takes to broom the dust/etc into the floor grate. Saw doesn't produce that much dust/etc in a single day....but let it go a week and you got a pile.