Major altcoins will moon eventually if a Bitcoin ETF is given a go-ahead but not immediately. We did see a huge outpouring of money into altcoins in early January 2018 to a large part from Bitcoin.
My biggest regret is not having invested in Ethereum and Ripple in the second half of 2016 and the first half of 2017. The returns would've been ridiculous whereas gains in the price of Bitcoin were remarkable but at least an order of magnitude smaller. I feel like an idiot for not delving into the space properly a couple of years ago. I do believe coins like EOS and STEEM have a great deal of growth ahead. It depends on how sound their fundamentals are. Steem the blockchain is gearing up for scaling massively and already has some of the promised interfaces and scalability updates released. The SMT protocol will be rolled out probably within a year. If the entire cryptocurrency space is going strong when that happens, there will be explosive growth in the DPoS coins designed by the Larimers.
The slow start of Steem the ecosystem is perhaps a blessing in disguise as it allows the current crop of Steemians to keep stacking up the coins relatively easily before breaking into the mainstream happens.