the fact that for Bitcoin to update the vertices is real in 2-3 years, but this does not mean that all alkyns will return to their maximum values. Those coins that are closer to the top of the positions are more likely, because it is in them that new money will flow
Most of the Altcoins will be able to grow in price no more than twice, Bitcoin, I think, no more than 3 times in the coming year, what will happen next is a big question, I doubt that cryptocurrency will be able to gain former popularity.