Well I am not sure if the kits are making a comeback, but folks are sure buying them up in a hurry, and paying ridiculous prices for them. I have watched guys pay upwards of $75 to $100 for a Goldberg Jr. Falcon[X(] I try to go to swap meets and auctions so that I can find the older kits "that Nobody seems to want anymore", but they are becoming harder and harder to find. Royal kits are going easily for more than $250.00. There is a Beechcraft Staggerwing from Royal on E-bay right now that has a top bid of more than $350.00!!!! For crying out loud, its just a box of balsa wood and some plans. For that kinda money you could buy a Lincoln Continental Band Saw and cut your own parts.
I think a guy with a decent laser cutter willing to cut kits from plans from the 70's and 80's at a fair price ($80.00 to $120.00 depending on size and wood involved) could make a very good living at it. Guys like me don't care if its not in the original box, I want to build and Fly the plane. Not have it sit in the corner as an investment for my retirement.