That is true , not all ICOs is scam. Sometimes it will rising after one year .
But, stay carefull with the scam some ICOs project .
Personally, it will be hard to hold coin for a year, there were lots of things to be happened and in my experience most of the alts that last over a year were not successful in terms of the price. I observed that the price of a coin will be at peak couple of months after the sale once it drops do not expect that it will recover anymore.