I think the same scenario will probably happen ten years from now. People will still regret that they have missed chances to invest in bitcoin and now they are not making huge profits from it. But IMO, people will not learn from all their wrong decisions unless they see bitcoin in a very high ATH. So it will be an eye opener for all to never disregard bitcoin as its value will always bound for a higher ATH in every year that comes.
No, it wont happen again anymore. As we see cryptos now are very popular and almost all people now know its history. I knew someone that is new to crypto and he explains to me how cryptos got his interest and he is planning to hold it for a long time.
People nowadays have a better thinking than us people on the past although there might be some regrets for the people that have recently discovered cryptos because they missed a big opportunity although it is not too late yet because there are still lots of people that are not yet into cryptos, imagine if they join here as well, the value of cryptos will improve dramatically.