The next person will also continue what Bukele has done if the next leader has felt such a good impact on his country through Bitcoin. And the next leader will not forget Bitcoin just like that when he sees better developments in his country after adopting Bitcoin.
So I don't think this will change in the next leader because the people of El Salvador have also agreed to this. After all, the residents there can also be used by trading via Bitcoin to circulate their capital and make a profit and that can be an additional job for the residents there.
It all depends on the benefits Bitcoin is able to provide to the country. If the new leader deems Bitcoin to be a good asset for the future of the country, then he/she will leave everything as is. Otherwise, you can say goodbye to the Bitcoin experiment for good. Last time I've checked, Bukele had a high approval rating even though many people in El Salvador were not happy with BTC as legal tender. It's likely President Bukele will stay in power for some time, so don't expect the government to abandon BTC anytime soon.
I'm certain the move will attract a lot of tourists into the country, meaning more tax revenue in the long term. Adoption is low, but rising at a slow and steady phase. Who knows if El Salvador hits the "jackpot" within the next bull market? Just my thoughts
