If enough people leave and the reason is given as the adverts, then eventually it may be decided that they dont make commerical sense being there, if only a few dozen people leave (or none) then they will probably make commerical sense staying
EVERY decision made on PF from now on is going to be about money I would imagine, as the purpose of this site is to return revenue to shareholders, the whole "ford / cars" thing is only there as a commerical vehicle to allow them to facilitate the achievement of that commerical goal.
A great shame IMHO, but I will still use the site im sure, so im not going to make empty threats about leaving it.