For sure, El Salvador, or the creator of chivo bitcoin wallet didn't expect a massive of users. Especially the even of the day that El Salvador is officially using Bitcoin as legal tender.
This is one of the major challenges if you are a software developer, but I believe it will be handle as time goes by, they don't expected a massive user I believe.
I think the news from El Salvador has affected the general bitcoin market, but with the wallet coming back online and the Wednesday market, the look will change pretty soon.
The wallet is going offline was expected but not to stay offline for long as citizens will like to carry out their transactions using Bitcoin.