if no one spends bitcoin maybe altcoins will be gone, but chances of that happening is very small, remember bitcoin is cryptocurrency a great for the future
Altcoin will gone and bitcoin will die, as such no one is spending money, I think it imposible, bitcoin created not to be stored but used for the transactions.
With the bitcoin, you can both store and use it. It is better to hold 70% of the coins and use the rest occasionally.