You want to break Bitmain's dominance of BTC -- build a better BTC miner than they do. My take on it is that they just want to make another coin and as is the case with all new alts they're hoping that it could supplant BTC.
I am not sure you can make it sha256d and have a lead over BTC asic...
forking of BTC POW would be fine if that can lead to 1000% better decentralization, atm we don`t have that algo, even the ones that are trying to not be asic are heavy on CPU, there are few concepts but all are in test net or development .... as cuckoo cycle and MTP that try to be very hard on memory use and light on verification
Also we have a lots of shit coins so I hope we learn something from them instead (maybe)
ETH is maybe only algo being not so good on asic, bitmain ETH asic is just 180Mhs which is same as 6x 580GPU... they did that by using 2+GB file (DAG) from which reads done randomly, so memory random read is main limited factor, but algo is no good and is heavy for CPU validation