I guess it's just personal opinion, because I do not like the booths at all, and love the table and chairs. We got the extra two and although they've been in the closet since we got them, if we need to seat two more people, we can.
The table and chairs gives so much more flexibility, plus I find the booths way too tight a fit (guess that's a personal problem, too
)
It makes sense to me, as the others said, that it's going to cost a lot more than it's worth to switch them out. It's really too bad, since you have a 2007 and probably want to keep it for at least a little while.
Anyway, good luck in whatever you decide!