Fusarium WIlt

My tomatoes have been unhappy. After some glorious progress they are just withering away to nothing. I suspected fusarium wilt, and after reading about it on the Internet, it seems it's a fungus in the soil and the fix is to not plant tomatoes, peppers or potatoes in those spots for 4 or 5 years. It's one of the problems with Heirloom tomatoes, but even with modern disease resistant tomatoes, new strains of fusarium wilt may attack those plants as well. Or I can just plant them and hope for the best. We have way more tomatoes than we can eat as it is, and we are still getting plenty ripening. It just makes me sad that the plants are not thriving.