That's right. The QBD (and QBO) V2 REST is going to be "end-of-lifed" on March 1st, 2016.
I will convert an existing Rails app to integrate with QBD via the SDK for a fixed bid price that I promise to not go over by a single penny.
I know what you are thinking. Desktop software is dead and QuickBooks Online (QBO) is the future so we'll just have all of our customers migrate to QBO. That reality might be about 10 years away but in 2015 QBD and QBO are not at feature parity. I had a business of 12 employees tell me recently that QBO still lacks the basic accounting features to run a business their size.
As of this writing, QBO is for the very small businesses while QBD is for the "big boys".