Altcoins today are struggling , yes no doubt about that but if much attentions are giving to some altcoins with lots of potentials, i think it will make altcoins standout in the market. although some altcoins lacks vision and there are several coins i believe will defintely change the market positively.
Altcoins certainly have a good impact on the market , and in the future I think a lot will change for the better , but at the moment there are few coins that can show a good product , as bitcoin strongly dominates.