Sorry, but I was chuckling when I read your question. If I ever waited until the end of a quilt to think of the next ones, it would be a miracle. I have at least three in active production at the moment, with another couple I do a few blocks on from time to time. I am also checking my stash for fabrics to do Pat Sloan's new Solstice sampler. I'm already half a dozen blocks behind.
There are four or five in the car waiting to be dropped off at the long-armer. I might finish something if I made anything smaller than a queen.
In short, waiting til I finish something (what is "finishing" again, anyway?) to think about something new is not in my nature.