El Salvador knows what they are doing. They were ready to handle bitcoin as legal tender, hence they did it. I don't think they will revoke it as it will cause a lot of problems. It's going to be a chaos for their citizens that invested in bitcoin or business that accepted bitcoin because it was a legal tender. You are just being very speculative and thinking only about the worst.
Does that surprise you? If you check this forum, you will find thousands of such clickbait threads posted by noobs. They just want to increase their post count/activity, so that they become eligible to participate in signature campaigns after sometime. We are talking about a country, where the parliament has passed a bill making Bitcoin as the legal tender (and that too with a super-majority). And the OP claims that there is still a chance that all that can be undone. The fact that El Salvador has accepted Bitcoin as a legal tender means that we are approaching the last stage of the "early adoption" phase. Now we will be moving to the "mainstream" phase.