Where could I store my assets in an emergency if there are no more bitcoins?
And you think if there's no bitcoin other coin would survive??
I can say with all assurance that if there's no bitcoin today all other altcoin will fold up by dumping 99 percentage.
This is a 50-50 possibility. It just so happened that Bitcoin is the first one but that does not guarantee that this industry won't exist without it. And if we would base on the present, with the same condition, as long as there are no restrictions on the usage of this technology, I think people would move to other cryptos. Not unless the cause of this instance is issue directly to Bitcoin 'coz it would affect the demand as well towards other cryptocurrencies.
As we all know Ethereum is next to Bitcoin when it comes to the size of network. So more likely it would be the alternative to Bitcoin investment if you are looking for one.