Got this email this afternoon:
We have some good news and some bad news. The bad news is that, as of 3/31/12, the Blockbuster app will no longer be available on your TiVo DVR. We are updating our technology platform and will not be able to continue supporting your device.
You won't be able to watch movies from Blockbuster On Demand on your device, but you can still watch on any of our other devices or stream via PC or Mac.
Your friends at Blockbuster