This is a sweeping statement. Check out some solid ALT coins. NEO, ETH and XRP.
This is one of the best coins I know.
Well this is what the insightful Tone Vays claims...
He claims that ETH, DASH, shit 99.5% of all the ALTS are scams and the only coin that will survive is Bitcoin.
So l guess we should all sell our Alts now!