With no frost on the horizon, it's fine to leave tomatoes on the vine to ripen. I've heard from lots of gardener who are tearing out their tomatoes, but I would rather pick for as long as possible. I think they taste better right off the plant. These aren't summer tomatoes, but certainly better than anything in the store.
The trick to forcing all those green tomatoes to make the change is cutting off the new growth. Instead of the plant focusing on making flowers and new fruit, it's forced to concentrate on ripening what's there.
Tomatoes are just a seed delivery system for the plant. When the plant can't make more tomatoes, it panics and will ripen what's left.
When frost looms, remove all the fruit and put them in a bag with an apple. The apple produces a gas which makes the tomatoes reach fruition.
Seems like yesterday when I planted my tomatoes, I'll miss them through the winter.