Nah, everyone loves Indianapolis!
Just wait until May when race time begins and all the charter flights start arriving.
If Concourse A is getting "crowded" let it. But I don't see how it would be getting too crowded anyway. Concourse A has always been busy in and of its own sense...TWA used to fly 757's out of there and Northwest has always had a brisk business. So they've added a few regional jets here and there. It is nothing the concourse can't handle as far as passenger loads are concerned. There is plenty of waiting room for the next passenger. If you want something to eat, there are a plethora of restaurants and eateries in the airport's central food area on the way to B & C. It is nothing that a person from A couldn't walk to. Just because Northwest has added new flights doesn't mean a new food court should be constructed in the A concourse. Keeping most food restaurants outside of security for a non-hub airport is probably the best idea.
Of course it would make sense to put ATA & Southwest together, Delta, Northwest, Continental, etc. all together in the same terminal. But right now I think some airlines are content on staying put where they are....like ATA I think really wants/likes being in Concourse C and I don't think convincing them to move without them putting up a fight would be very easy.
Right now I think the Indy Airport Authority is probably pleased beyond belief that the airlines are doing a great business, a new airline is coming in, and ATA and Northwest are committed to great amounts of growth = more revenue from PFC's and landing fees for them.
Despite the fact that the airport might be getting too small for the operations it is currently providing, the airport is still very reliable and convenient for its customers, offers great low airfares to practically -everywhere- and draws from a very large geographic area. So let them run it, enjoy the revenue, and get down to work on the new airport terminal.
if assumptions could fly, airliners.net would be the world's busiest airport