Many project are now starting off with a mvp/demo, it probably means than in the icos field the bar will raise and people, hopefully, will become wiser and stop investing in project which are promising unrealistic goals.
But you know, sometimes it's really hard to say if goals some project are aiming for are realistic or not, especially in some innovative areas. I'm not talking about those projects that clearly have ridiculous and unrealistic hardcaps for really average ideas.
it's true that sometimes it's hard to figure out which ICO will well and which won't. but that's why you do research and if you're still in doubt, don't invest.