Not only the alt coins you mentioned have dropped. Currently we experiencing a full bear market and almost all alts are down.
Fact is that nobody knows for sure if alts will recover, when they will recover, wich ones will recover, etc.

Personally I don't think all the alts will recover to old ATH's. Only the decent ones will.
A lot of wothless projects where created and hyped during last bull market.

TRON and ADA in my opinion are examples of decent alts that will recover and reach new ATH's.
Just my 2 cents on this subject.