I'm more and more concerned about ETH. There are some technical issues (related to scalability and not only...) and, in addition, the dev team seems completely uninterested from token's price/valuation.
Currently, each Ethereum token unit or ether, in short, is priced at $600. And Ethereum has a market cap of $69 billion. Although Ethereum has seen many ups and downs, the platform as a whole never has stopped progressing.