Gina, That has been much of the point about FMV, there are innumerable large trees that make tons of figs every year, that have FMV, and it is not an issue. Dennis and I walked through many of the trees trying to find one that didn't have some sign of infection, and were unsuccessful.
Many of the trees that appear small and not thriving may be that way from several years ago when they had a "killer" freeze that did a lot of damage to many of the trees, which is still evident today.