Framework-dependent projects tend to go stale and become "ew I don't wanna touch that, it's so last year, we should probably replace it with [newer version of framework that's gonna end up being much harder to upgrade than expected / other framework]" surprisingly fast once eyes are off them, in my experience. Without someone competent doing continual upkeep, the next guy/gal's gonna try to sell the re-write anyway. May not succeed, but they'll try. Framework or no.