I have been keeping a close eye on the tomato plants, and while the crunchy leaves haven't regained their liveliness, they haven't seem to have gotten worse. The stems themselves are healthy and green, and this gives me hope!
I've harvested 30 tomatoes so far with at least another 30 ready in the next week. I took a little advice from a random forum post on You Grow Girl, and I have been pulling the tomatoes from the vine JUST before they fully ripen.This helps keep the pests from eating the fruit. I've been placing them in a paper bag to ripen the rest of the way, and it only takes 3 or 4 days.
I think when the plants start flowering, or growing fruit, they stop concentrating on developing stems and leaves, and focus on creating fruit. Seems plants can only focus on one or the other. I could be wrong, this is only observational, but it also happened with my two strawberry plants. The one that didn't have any blossoms on it when I bought it grew large. I got very early fruit off of the other, but it was a puny little thing and never got any larger.
I'll keep this in mind going forward...but I also wonder, if a tomato transplant has blossoms when I buy it, can I prune them away to keep the plant growing a while longer?