Blockchain and Cryptocurrencies go hand in hand, there is no way to develop one and discard the other, all you need to do is read the news and you would see the recognition that blockchain is getting and in extension Cryptocurrencies, It is definitely here to stay.
yes cryptocurrency has stayed but it will still depend on the community if it will be supported or not. If you can see a crypto that has no support coming from the community then that crypto will eventually fail and its market price will drop. Afterwards that crypto will be left behind by the imvestors. However, after it will be dumped that crypto will still stayed and even function and has a chance that it will going to have a good market price rally for that crypto.