If they don't make it then someone else will maybe a few months later.  The only way I see to stop asics from being developed is for a coin to have a position like the monero project where they just openly say, if we find out that there are asics on the network then we will fork the code to break it.  I don't see bitcoin core ever changing their algo, and even if they did the miners would keep on mining the old chain or just switch to bitcoin cash.  I think Satoshi let a genie out of the bottle and we might not be able to put it back in.