I really don't see how you're going to make it--the ME is a total "crap shoot" (as I think another poster labeled it). I have been from my airplane seat to the Pop Century in under an hour (this past April) and I have been on the ME itself for 2.5 hours (some moron couldn't identify his own bag, but don't get me started)--that happened this past October. The bus time alone from the Pop to the Magic Kingdom, then a walk to the Contemporary (no resort to resort buses)--you're talking at least thirty minutes right there. I did it in January from the Animal Kingdom Lodge and it was close to forty minutes from bus stop to restaurant check in. That said, I have had some terrific CMs who understand that things happen and hold the reservation, but I, like the posters before, second the sentiment that I wouldn't count on making it. And honestly, what a disappointing way to begin your vacation-rushing from the airport, trying to blast through check in, ripping to the Magic Kingdom, and sliding in to your reservation by the skin of your teeth, if at all.

Check with some of the other character dining experiences and see if anyone has cancelled (which I have done a couple of times with great success), and pick up their reservation> I certainly wish you well and hope that the success or failure of this doesn't make or break your vacation. Have a great trip