In the end, Ennis might be quite fine as a replacement for Ariza. Moute wasn't counted on in the playoffs (although he could have helped) so in theory if healthy they could still have a nice wing defensive rotation to switch on Golden State. I think Boston and Toronto also have potentially very strong defensive rotations to switch hard on Curry (the only way IMHO to beat Golden State in that 10-15% chance range versus 1-5% is to beat up Curry physically as much as possible and double him on traps/switches strategically, make Curry work on defense, switch everything you can to avoid easy three looks, and don't double Durant to leave Curry/Thompson open (ok to double Durant if it leaves Green open) and hope he doesn't go too crazy on iso and let Draymond shoot outside and hope he is at 25-30% or so versus higher 30s) and their outside shooters, but the Warriors are so talented that you just have to hope you are hitting your shots better than they are 4 times out of 7 and that's tough obviously. If they have a healthy Cousins too, it's even tougher. Five All-Stars is five All-Stars.
For Houston specifically, switch everything with a strong wing defensive rotation, shoot over 50 threes a game and hope you can hit near 38-40% and no worse than 33-35% and Golden State shoots a lower percentage. Houston used a very overall good strategy last year, they just didn't execute well enough when it counted.