Everything you say is absolutely right.
What I meant to say however (and I apologize for the way I phrased it) is that this is makes it even easier for indie developers to reach a wide audience.
Not only do I expect that it will be fairly easy to port Android Tablet games to the Fire TV, I also think that the strategy of offering a TV box that has a Games marketplace as a bonus feature is a strategy that will allow Fire TVs to sell a lot more than Ouyas.