Crypto currencies are just in a wider abundance so the investments in one specific crypto are dying off but others are starting to gain popularity and worth. I also want to state that mining certain cryptos can be easier than others (such as GPU mining) so those are gaining more favor in the mining world as it can be very inexpensive as opposed to the old bitcoin mining boxes that cost more in electricity than it's worth. It can really go either way but I think things are just leveling out as more currencies are created. I think it'll settle once people are settled on what they like more.