Good thing is that 2.0 won’t be out for a while so no need to worry too much.
We’ve been in close contact with the angular team and have started to prepare ionic for the migration. A big win for us is that we use raw JS inside of our controllers and don’t rely heavily on angular functionality. Yes there were will be some things that we have to rewrite, but it will give the devs a chance to implement the lessons learned over the past year.
Since we work with the angular team on Angular Material, they have been in contact with us about testing out 2.0 when it is ready. They have been very proactive about working with us to make sure 2.0 has the tools it needs for Ionic, such as the new routing system and animations. Rest assured that the lessons learned from Ionic and Material will be applied to Angular 2.0, and material will begin to find its way into Ionic.