So if masternode will be blinded, will it help you?
Perhaps not the same blinding you're talking about, but this might help:
It wouldn't necessarily need a complete redesign to shut that attack vector. All that's needed is to prevent the mixing masternode from knowing which outputs (of the mixing transaction) belong together with which inputs. The mixing peers could do a key exchange and encrypt their own outputs with random mixing peer's public key, and decrypt the others' outputs they can using their private key, and then pass clear text outputs to the mixing masternode.
But then again, before that kind of motivated attacker (who infiltrates all the masternodes in the world) appears, DASH will need to probably grow at least 100x, so that's gonna be maybe a year away still.
And sorry about posting OT in this Monero thread.
That's a dumb assumption considering it's easier and more expansive now and a dash mining pedo ring is motivation enough. But keep to the shill script; i'm sure snake oil sales is a noble profession in some circles.