Not right completely. If you are holding coins like BTC and ETH, you will get somewhere (may be millions or billions based on how much you hold ).
Yeah but op is talking about ICO and not those coins that is worth holding. It's not a good idea to hold coin/token from ICO because we all know what is ICO and most of them are just shit. So if you find an opening that you think you can make a profit. Don't hesitate, just grab it.
You've said it all.. But there are also sometimes where you blame yourself for dumping early, because sometimes you dump and blame yourself later for doing that, same happened to me with Hydro project