Even if some of the hardcore do quit over the changes, there will be others who start up crafting that previously couldn't be bothered because of the over intricate material requirements on many of the lower synth items. I honestly don't see most people caring one way or the other. FFXI had a far simpler system for crafting and it was pretty popular, and these changes aren't even lowering synthing to that level. People are going to keep doing it regardless, it's just likely the demographics of who is synthing that will change.