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I think that people are only speculating on the price of altcoins. The only coins people actually use are probably Bitcoin, Monero and Ethereum (although I have no source for this).
the only "actual usage" for any cryptocurrency are these:
1- bitcoin, since obviously it is the first and
only cryptocurrency anybody outside of crypto world knows of and it has been around as a real currency for 8 years and ....
2- litecoin, it has been like the second cryptocurrency and it has been around long enough and there are actual services online which you can find that accept litecoin as payment. also it has an stable price for most of its life.
3- Monero, it is THE anonymous cryptocurrency and because of the "real" anonymity features it offers, this coin has an edge for being accepted as a payment when privacy and anonymity is of great concern.
4- Dogecoin, this coin had the biggest community and because of that some services has been created around it (I have mostly seen games being sold for dogecoin with big discounts).
and things like ethereum are not a currency, they are mostly a platform made to do specific things (pretty badly I should add) and because it is centralized that coin will never be as successful as other decentralized counterparts.