Plenty of other warfare elements would need to be modified, such as the health of the nodes. It takes forever and you have to unload a good portion of your arsenal to work their health down. Boring.
I theory it would be really fun, even with the Skater McGee floating skateboard.
Raptor taxi no good?
That's just wrong. 2 guys standing next to each other with the linkgun take out a node in no time at all.
And there is always the orb.
You guys who are afraid of vehicles just need to learn how to deal with them. They are easier to destroy than you think. Big targets are hard to miss.
Vehicles in UT3 can easily dominate certain maps regardless of the skill of people attacking them.
In my experience, I am talking several thousands of WAR and vCTF matches with top vehicle players, it's very rare that this happens. The tank at the air node on islander and in the downtown prime are the only ones that are very tough to crack. And then, only when in the hands of a very skilled driver.
The Goliath is easy to take down - you can just jump on top of it and it can't do anything unless the driver switches to the second seat.