That`s not totally far to Zcash, the price decreasing is totally expected everybody mining did know this..except you? (Price in the beginning higher, and then down, down, down, down).

Zcash did it much better then i expected, i have fun mining it whit my big rig and in the cloud. 
Zcash price will be more stable later on when the block-reward gets normal.
Until that time just see day by day if you mine Zcash, Ethereum, or Classic.

If you mine Zcash, just like all smart miners sell your coins in this period, you can later always buy Zcash back for the lower price.