By "top currencies" you mean those cryptocoins having the largest market capitalization, such as Ethereum, Ripple, Litecoin and Cardano? I would say that rather than the "top currencies" the best ones will survive in the long term. Having a large market cap is no guarantee for the future success. Unless the team makes a lot of effort with the continued development, none of the coins will survive.

I have seen only one coin surviving in the cryptocurrency market without any sort of continued development. That honor goes to DOGE. It was started off as a parody coin, but within a short time it gained a lot of users and they managed to build a lively online community. The creators of the coin (Billy Markus and Jackson Palmer) disowned it later and moved on, but the coin is still going strong.