I wasn't overly impressed with Amazon's autumn cup... I've no problem with streaming non-live events, and a couple of films I tried on the free trial were perfect in HD/UHD. But (on my Virgin Media V6) the live games just weren't a patch on what an HD broadcast channel could manage. I couldn't quite put my finger on why, but I've seen a few posts on other fora, all reporting similar.
I'm also not a fan of multiple subscriptions. Rewinding to when BT & Sky shared the Euros, it was a messy solution and BT getting the sole rights was an excellent outcome. I'm fortunate enough to have Sky & BT Sports, but I'm firmly in the camp that BT do an excellent job with club rugby, and it would be a big shame (and a brave decision by PRL) if this finished next season. Pundits could move around as has been mentioned, but all the same.
Although semi-related, it would also be good to see the summer & autumn international tours bundled into a new TV deal as some reports seem to think we're moving towards.