They (bitcoin core devs) will not be able to stop inscriptions or any other data storage technique that will appear in the future. Same for other blockchains like litecoin and dogecoin (all of them are being spammed too). So the only rule we have to minimize the spam is the 1mb / 4 vMb block limit.

In any case, Luke was able to scare some of the spammer in the last week as the fee is coming down atm.