I question that logic, because if no one is using those altcoins or even buying them, they can go to zero as a practical matter.  Even if a coin fell to 1 satoshi, if there are no buyers, there's no chance for a person to sell what he has.  Take a look at the Yobit 1-satoshi graveyard.  Put in a sell order on one of the crappiest coins there, and that order might sit there forever, never getting executed.

As far as this prediction in the OP, who knows.  Crypto is pretty resistant to typical analysis, as I've said many times.  It's not like the stock market where there are businesses behind a stock.  Crypto has no earnings, no P/E, none of that--there's just news, rumor, and sentiment, which translates into demand.  I'm not sure if anything drives the price of a coin except supply and demand, so where a given coin is going to be 10 years or 5 minutes from now is just guesswork.

I do agree that a lot of coins are headed toward zero.  Most never get used for anything except speculation, and that will probably end at some point.  And think about it.  How many different coins can the market really support?  They just keep coming and a lot of them are just crap.  That can't continue indefinitely.