I think widespread corruption at fifa makes this situation a little bit different. I doubt countries will boycott it after Blatter's resignation but there will surely be a few countries like England complaining that they should have the world cup or it should be put back to another vote. They wont pull out though.
As I had posted earlier, a lot will depend on the FIFA presidential vote. If some US-puppet, such as Prince Ali is elected as the president, then he can legitimately cancel the event in Russia and conduct another vote to decide the hosts for 2018. If someone else is elected, then indications are that England might try to organize a paralell event in London.