Interesting point of view.
I'm on exactly opposite end - I'm going deeper with ICO's this year.
Your points are pretty valid, but this mean you just need to be more peaky where you are investing. And I'm always and only buying during the pre-ico phase, avoiding those ICO's with massive pre-sale.
At the end we are the ones who decide what to do with our money, however those that have bad experiences investing in new coins and new projects should probably think twice about investing again in those projects after all if they have been unable to choose a coin that becomes successful then it's probably because they lack the skills to distinguish a scam project from a legitimate one.