If the trees have not been tended to (ie: thinned) properly for a long time,
it is quite possible that a good storm could topple them ALL. Pines are
shallow rooted and tend to go down like dominos. I once saw an entire
hillside with a 40' swatch of downed pines that ran from bottom to almost
the top. Some tree maintenance might be a good idea even if you don't plan
on removing them all.

Giselle (who even on a recently maintained/logged property lost about 10
hardwood trees to wind this year)