Hi whomever you are, :-) >>If I plant this in a pot with some micorhizza on the bottom will it be likely to root?<< Keep it damp and remove any fruit that has formed. You want it to grow roots, not fruit, at this stage. The micorhizza are not needed. If there is a lot of foliage remove all but the last couple of leaves. Leaves will just drink up water and cause dessication. Depending on your location, there may or may not be time left to ripen new fruit. In my experience, it usually works but 'taint worth it. It is generally considered not good to put tomato refuse in compost since it's easy to carry diseases. I know people say the heat will destroy any diseases but all compost piles don't always heat up enough. Why take a chance.