Tomatoes like to be pot-bound, and do very well in smaller pots also, so long as they are kept moist and fertilized. On my tour of an organic tomato farm, all the producing plants were in one-gallon pots. My grandfather did tomatoes that way for years. The pot gets hotter in the sun (desirable in our northern clime) and planting in fresh soil in pots avoids blight issues.
Blight varieties have been on the uptick, and in a Canadian study I can no longer find online, their genetic testing showed that 60% of emerging new blight varieties were generated by home gardeners. The other 40% was commercial growers. Apparently commercial growers are responsible for all but 0.01% of tomatoes grown, so this is an appalling record for home growers.
There was huge concern, because some of the new blights were showing signs of moving into other nightshades that had previously been immune, like peppers and eggplant.
(People tend to go away in the summer for 2+ weeks, plants don't get watered, and they are stressed and perfect for blight once it rains again. The plants are dying when they get back and look ugly, so people don't bother with them except to throw them in the compost once they are covered with blight and half-rotted. After a couple of years of that their soil has a crazy high blight titre, and they and all their neighbors will get blight even when conditions for blight are marginal.)
So. Done tomato plants should never be composted; the environment of the compost is absolutely perfect for blight and it is in the air, even if your plants were fine. Dry them and burn them or garbage them.
Tomato soil shouldn't be used again for tomatoes or potatoes - add it to garden beds for anything else.
If you have wet Falls, cover them with clear plastic so they stay dry while they're finishing. Pots are great because you can move them somewhere dry, and tomatoes will finish ripening on the plant even if they aren't getting that much light inside, so long as its warm. And giving tomatoes calcium or other amendments after blight has already started will do sweet FA.
Also, tomatoes are perennial in their native south america, and will grow through the winter given enough light. One woman I read about had a 3yr old tomato plant in her greenhouse.
