.... is matic and solana hype coins today that hot today but not tommorow?
Most coins are probably hot and overpriced right now and will have a time to cooldown. I wouldn't exactly say these two are crap coins they do have a good ecosystem if we put chain centralization issues and a great community of users.
Look into Metaverse if you are planning one or two tokens in your port fot long term storage. This market could be bigger in four years.
SOL & MATIC both have use cases in the market. But you need to keep up with their updates if indeed users and developers will be utilizing their respective networks. In my opinion, BNB is one good alt to hold as it is backed by top crypto exchange as well as they have many services now. So for me, their lifespan here in crypto market is somewhat promising than most alts.