It's possible to simply pick off most of the bad tomato leaves and leave anything that's still healthy, especially at the top. Tomatoes really don't need to be covered in leaves to survive. Most toms around here have set fruit and are almost naked so that the fruits can start to ripen in full sun. (I'd gladly trade you some sun for badly needed rain)
As for the sage, once you've got root rot, there's no saving it. You can always check seed catalogues for varieties that aren't as prone to flowering, or even contact seed sellers for recommendations. And then either buy a plant somewhere or get the seeds. There are so many varieties of sage out there that I couldn't begin to guess what might take your fancy. I believe all will flower, but some less than others because it's how sage reproduces primarily. Only sterile plants won't flower and I don't believe there are sterile sages out there....yet.
