there have been a lot of altcoins years ago which people thought will be still on top and strong just because at that time they were on top of the list like #1 altcoin but eventually their bubbles burst and they started their descent to their graves. some of them are already dead and some are still around but nobody even remembers their names.
this trend will not change anytime soon because these "major" coins are still the same bad coins that just got bigger than they should have been.
This is something that I have noticed as well, this shows to me that regardless of the market cap of a coin, if that coin does not really have an use then that coin is going to eventually go back to its real value which is zero.
Investors should be aware of this, if someone invest money in a coin just because it has a high market cap then he is not an investor, he is a speculator and while money can be made that way the real question is, if the person thinks he is willing to take that kind of risk?
Many people think they are ready until they face a crash like the one we saw and they finally realize their mistake, it is too late for them but nor for us that are watching the reality of the market of altcoins and how most of them will probably not be around in the next years.