There are a lot of reasons that could cause ICOs to fail this year but the most effective one would be the fact that people are no longer willing to invest in the coins like they were before.
I want to add. People lost trust in this smart invest. So many scammers, real and hidden. Watch on the statistics when it was published how many ICO were successful after tokensales. And what we see? Practically nothing interested. As year ago as now BTC, ETH and some coins else. It's sad