Long term is the key no doubt but any people would agree especially altcoin investor because they are always of the opinion that they can spot a good altcoin and make an investment that could yeild them 100-1000% within some months which is very very risky because it's a two sided affair because spotting a good coin is one and another is that coins actually going green because it can go red too. So buying Bitcoin steadily and maintaining focus is what will guarantee you success in long term holding.
Long time is actually the key but how many people are able to hold for long time and does that are holding already have it figured out, will do everything possible just for them to just buy and hold and it is less stressful you don't have to keep doing analysis all you just have to do is to know when to buy and when to sell that is like two most important things when it comes to holding then emotional control is very important the same time, and people are really picking intrest in altcoin than bitcoin not because of anything but because of that profit they want to make and it's good that you know that there is risk but people don't longer mind.
We know that everyone wants to make profit but it is better to know exactly what they are getting into so it's not something to worry to much about, and once the investment don't go well they will personally embrace what ever it comes with so it's better, and there people that altcoin is what they know how to do better, you can not compare your self with such people it is usually better, you might try it and it does not work for you, but the king is still the best to invest in you won't be scared even if the price is down you know that no matter how it is you will recover your money in no time.