This will not happen again if coin will gain few millions of marketcap, diff will go up significantly and attacks will be more expensive. Now when XMC/XMO both are dead and abandoned and broken there is a chance for this coin to become a new home for cryptonight ASICs.

In order to gain market cap devs must burn some of their premine and put the rest into an escrow account or at least put it on few addresses and publish view keys from it.