See, if this was local software that you could buy once and keep forever, an event like this would not have felt so full of foreboding.
On cloud-based web apps, there is no opt-out short of ceasing use of the program entirely. Don't want their new features? Too bad, we're going to roll them out anyway, and there is no turning back after that.
I'm still puttering along just fine on a copy of Office 2010, so my opinions may not be representative of the majority.