[hdmkv]

Does anyone think Android TV will ever get Amazon Prime?

Nope. Amazon has removed Apple TV and Google Nexus Player from their store, and would prefer you use Fire TV to access Amazon video/Prime & be locked into their ecosystem (not Apple's or Google's).

But, there are two ways you can watch Amazon video on Shield TV:

1. Use the tablet version of Amazon's app (requires mouse) (haven't tried it out myself)
   
2. Use this Amazon add-on via Kodi