Leather seats are comfortable enough. They just aren't durable. Go to any junkyard and see what several hundred thousand miles and a decade or so does to leather seats. The very best upholstery material is MB Tex. Go to a junkyard and you will see that it lasts 30 years or more in the hot Florida sun and rain.
They con you into the leather seats by forcing you to buy them to get some other option, like a sunroof or a fancy stereo. They are simply not worth the extra money. Again, sheepskins are cheaper and more comfortable, and can easily be cleaned and/or replaced.
If you are only going to drive the car for six or seven years, it really doesn't make a lot of difference, most of the time.
There are plenty of Lincoln Town cars available. You just can't get a brand new one. In any community where there are a lot of retired folks, you can find a low mileage Towncar for a good price. They are a little large and ungainly for me, but they are comfortable and fairly dependable.