I'll live with Kawhi, Patty or even Manu taking any set play 3 point shot... then, generally speaking, shooters going cold can happen to anybody, including the Spurs (remember Danny in the 2013 WCF?). Likewise, shooters going hot can happen too (Patty making timely 3 point shots in the 2014 Finals and busting games wide open comes to mind).
I would be more concerned if Danny wouldn't be playing defensively as well, but overall, I'm pleased with his play on that side of the court (and I don't have numbers in front of me, just eye test).
Obviously, if Danny starts hitting at a respectable rate again, then much better. It would remove some pressure on our defense, and that's always welcome.
I just don't think Danny hitting 3s is a sole factor that will make or break our season.
Then again, we might not be better than the Warriors, regardless of that situation, when the time comes. That can happen. Or maybe the Warriors won't make the WCF (injuries, slump, you never know), so I don't worry about that right now. I just like how we look defensively, and I think our offense is shaping up very nicely.