I'm not trying to be pessimistic here, but I think this list will take ages to get filled up, it may even take quite long to add another country to the list, this is not cause Bitcoin is not a great currency/investment option, but just basically cause governments cannot control it, thus they'll definitely be reluctant to take the path that El Salvador has taken, in the past few weeks, some government officials from other countries have openly criticized El Salvador's decision, it just goes to show what the rest of the world thinks about it.
Having said that, I expect Bitcoins rapid growth to continue, with or without governments acceptance/adoption, the thing remains that their level of control over the network remains essentially limited, thus they seek to do so through centralized exchanges and other centralized services crypto users submit their data to before using their service, I do hope that somewhere down the line, governments look beyond their quest for control and accept Bitcoin as a change/good alternative to their monotonous traditional financial system.
It may take a while to add another nation, but even just one is a huge deal. We are talking about a nation that started off with what 250? 350? Something like that and already has close to 1000 on the books (700 we know, but they do not let us know beforehand so I am sure they are working on getting more as we speak right now). It means that even El Salvador alone is a huge deal and following how it will be awesome for them would be great too.
On top of that, even if it takes time, these things do not happen overnight, it will take time to add in 2nd, but from 50th to 51th could be same, after we have 50, the 51th will come in very easily. It means that we just need to wait to grow gradually but eventually it will become better and better. When that happens, we are going to end up with something much more profitable for retail investors.