I have also noticed that during these two last years, the altcoins are not getting much attention, some of them will never recover from their peaks. This next year we might see a shift in the altcoins behaviour
When you talk of a shift, do you mean a positive or negative one?
As far as i know, altcoins have always had the problems you talked about, a few of them pump and dump, and from there they do not rise again. Now that there are more altcoins with every passing moment, it becomes even more difficult to get lucky and find the ones that will generate you any profit.