If we see the history of Bitcoin, then it's pretty easy to see how Bitcoin recovered its price. It would take time to recover, but eventually it did. So at the end of the day, holders don't need to be regretful. I am talking about Bitcoin, not about any other altcoin. Because even though the Bitcoin price has recovered, many altcoins haven't recovered yet. Even those who bought Bitcoin at the top in the last bull run, I believe they are almost recovered. If they are still holding, they will be in profit within a couple of months. Bitcoin has given us a costly lesson that holders won't regret. We should take that lesson and keep it in mind for the future.
Bitcoin, has proven to be the best and shouldn't even be compared with other coins, it has a solid foundation hence it has gain widespread adoption and has made a significant outstanding performance by increasing it's value over time since from it invention and for investors it outperforms when view on a long term perspective of over 4 to 10 years or more where you have the compounded value of your investment over time.
Right from time their is never a coin competing with bitcoin. Bitcoin have always been leading others, since the creation of bitcoin till this time is a good evidence for people to see the standard. The market value is enough for people to see that bitcoin remains the best and no other coin can compare. Sometimes when I go in the market and i check the value of altcoins it is so low that it is not even increasing like bitcoin and this is to say that this altcoins have long way to go.
The reason why some people involves themselves with altcoins is because they lack the right understanding, I think some people just think all cryptocurrencies are the same, they all have the ability of giving profit. For those that truly understand bitcoin will always stick to it.