How about...you were wrong in 2015 and you wish you would have bought in 2016?? OMG
Then what prevents you from going all the way back to 2010, when it was possible to purchase 1,000 BTC for just $1 from New Liberty Standard? I am quite sure that there will be lot of people regretting the fact that they didn't purchased BTC in 2021, after a couple of years. IMO, there is no point in talking about the lost opportunities in the past. We should focus on the future, because everyone knows that the future potential looks very bright for Bitcoin.