This year; ieo unfolded.
It was supposed to surpass ico and be a better crowdfunding method; but it has gone cold faster than ico did.
If you compare Your experiences too; between altcoin and bitcoin; you would notice that
1. Altcoins are so many; that they replace one another.
If an old altcoin dies
New altcoins will replace them and old one will be forgotten... It goes on and on
2. Bitcoin has maintained its class and importance;
Is it that bitcoin is the only hope for the future ??
IEOs didn't get too much attention indeed unlike ICOs who really became a trend and I think probably because IEOs uprises at the bearish market or perhaps, investors lost their trust to invest in this kind of project. Getting back to the question, I think not only Bitcoin will be the hope for the future since there are several altcoins can perform well as Bitcoin such as ETH and more. However, we can't deny the fact that the power of Bitcoin could lead other cryptocurrencies into the future.