I just bought one of the affected TPLink models. Personally I hope this means more vendors ship a good quality copy of OpenWRT a la Buffalo (though I ended up sticking with their modified version) as an officially supported firmware. People who buy premium routers are aware enough of the benefits that it is worth it for Buffalo to ship it on their devices. I can't see it not being a value add for others.
Sorry, I guess it's more accurate to say that the model will be affected in the future. I'm obviously still able to put OpenWRT on the one I actually own.