3-4 ranking coins to be taken out is much I think , though at some bull time there are couple of coins did not maintain its rank 10 position yet some of them comes back after the bull run meaning those who replaced them are just Pumped by the whales to bag money.
Having some sort of change must be something big, if there is just one coin that gets out, that means it was something to do with that coin alone and not a general market thing, but having 3-4 of them out means that we are in a bull market.
Bull market makes this possible because in the bear market we are in right now everything went down in value, that means when the bull market comes and some stuff go up 100% while others go up 20% that will change things, and it is possible for lower cap stuff to grow bigger and quicker as well. That's not really a tough calculation, lower cap means less money growing more and that could end up attracting more people as well.