"due to the cryptocurrency's current price fluctuations"
I don't know if you're aware, but BitCoin's price has never stopped fluctuating (wildly).
It's only because it is the funny money granddaddy that it has attained such heights. As usual, the first into the pyramid scheme reapes the most rewards.
Adopting BitCoin as legal tender. I don't think that will last all that long. Then again, it's El Salvador, so they can go ruin what's left of their economy, it won't be a big problem on the world scale.
It will be a problem for the poor in El Salvador, though.