Well, some people see BTC as a currency too, but I think it's hard to use it like that. At least for me, I wouldn't want to spend it just like that on groceries or anything else unless I had no other choice. Also, A lot of people are already regretting missing out on Bitcoin, but most people don't care or don't even know about it much. The number of disappointed will grow, but I don't how fast.
Yes, it's true that in the next 10 years from today people will still regret failing to invest in Bitcoin, the same way we have many regretting today for failing to take advantage of it when they had the opportunity 10 years ago at a cheaper rate, which is one thing inevitable when it comes to new innovation, as not everybody will be interested in it at the first instance, while others afraid not to lose their hard earn money, and as such miss a golden opportunity which Bitcoin offers. But one thing we all need to know is that not everybody will be interested in Bitcoin, and that's totally okay, but us who understand and know how it works, let's not fail to keep accumulating more now that the price is low that that when the price goes high, we stand to be among the lucky ones who will real the profit when Bitcoin goes 5x and 10x.