I think you assume this without knowing all the possibilities. Timing can work to the GOP advantage too, if it brings moments of severe truth closer before elections.
By that time the election won’t mean much, no matter who wins it. Obamacare is CONTROL. However is in power in Washington will be loath to give up that control. Some may fight tooth and nail to prevent it but once it is established they will fight to keep it and use it to their advantage.