1. Alright, great. He just has to wait until they are exhausted people with bows. Which, since they are flying, will be much, much faster than a walking human would tire...and since they're firing bows or whatever constantly (or until they run out of arrows), faster still.
2. Unless those magic weapons have at least a +6 enhancement bonus, they're dealing 15 points less damage per shot. And while critical hits and buckets of acid damage him, they will be healed next round because regeneration 40. Plus, both of those are ammunition-sensitive.
3. That makes it less a "village" and more a "nomadic tribe". How can you have a village without any tools, buildings, or whatnot?
4. Not what I first read. Besides, even level 5 characters should be freaking rare. and Fly actually would work, because unlike every civilized race I can think of, the tarrasque does not need to stop for exhaustion, sleep, etc.
5. But it's a fun argument!
6. Gust of Wind makes a gust around 50 mph. This is a Severe wind. Even if you somehow managed to cheese your way up to hurricane-force winds, the tarrasque would be unaffected. As for dirt, not only do you not have the ability to carry a few hills' worth of dirt, the tarrasque is smart enough to avoid being buried and can dig his way out of loose dirt...especially since many depictions have him slumbering underground, in rock.
7. I can't believe I didn't seize on this before. The raptoran non-village might be able to hold out for a while, but eventually they would run out of arrows, buckets of acid, and dirt; eventually they would tire, thirst, hunger. And then they are doomed, because they can't sleep on the wing, they can't bring water up, and frankly when you're going to die of exhaustion or tarrasque within a day who has the time to die of hunger.