Is it wise wise to rely on a single coin, if you are a miner? New coins are coming each day. I mined few ETH, miss those old good memories. There is tremendous diff and mining becomes less profitable. Besides POS is coming anytime and very big number of miners will jump into other coins.  What if thousands of gpu starts mining zec or other coins at a time ? I hope I will get another coin like eth in future. That will make my mining profitable again.