At least one good thing that is happening is that many Presbyterian USA churches and members are leaving the denomination. Good sign, especially in the land of fruit and nuts.
They should check out the PCA Presbyterians.
But the worry is that the PCUSA, UCC, PRC, RCNC etc. are 90% of the reformed movement. The splitting of the few doctrinally sound 10% to the PCA -- what did that accomplish? Purity with the accompanying loss of 90% of congregants?
Or was this actually an error where the devout, strongly believing, conservative Presbyterians left the PCUSA just when it needed these folks to stand up and shout and say "I ain't gonna let you make the Reformed movement the Gay Reformed movement -- if you want a Gay-Marriage "church", create a new religion of your own".
I see only grave dangers in the 10% of conservative folks leaving the 90% to the dogs so to speak -- this same thing is happening to those very congregations that left -- see the EPC has now voted to have women pastoresses -- how long before lesbian married pastoresses?
My gut feel is to stay and fight.