Zcash is just a failed experiment, and I don't think any of their privacy solutions would ever be accepted in Bitcoin.
I don't want to turn this topic into shitcointalk, but I had to notice that zcash, despite all it's privacy tech, is heavily centralized coin.
Currently ViaPool has over 44% of total hashrate, so it's not very hard to perform attack on this network, and all privacy would mean nothing.
Oh and let's not forget 10% foundation reward shady tax., I forgot to say that before.