Tomatoes can be successfully grown in pots, Ive been doing it for years. It might just be because it's the end of season. The stuff on your deck is just spiderwebs. They do look rather wet; do a finger test on them to see if they are getting too much water, tomatoes are funny, they don't like to be too dry or too wet, they want to be somewhere in between. Also I would go ahead and remove the dead leaves, the plant should produce more. Have you been fertilizing? Tomatoes grown in pots need quite a bit because of all the watering.
And maybe bigger pots next year.
