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 ??
because Bitcoin is the pioneer and the most trusted currency with small volume.just like other First on their line as long as it is maintained and progressing people will never look for another that is same here in crypto,People trust Bitcoin so altcoins always a secondary's or just an option.people might use them or not while bitcoin uses by almost all of the cryptonians so expect this being popular and wont be replaced.