It seems like we just need a wrapper that lets you pick whether to use Parse or Backbone. That should eliminate the worry of lock in (you'd still have to add the server code if you convert away from Parse, but you'd have to do that anyway).
A) if you don't use Parse you're going to have to write server code.
B) If you do use Parse and decide to change in the future you're going to have to write server code.
The outcome is the same however with option B you will have a working app 70% faster. Parse is great for moving fast while you search for product/market fit.
