I think ICO tokens will growth only that has a real product. For example, 3DES is decentralized slicer for 3D printing industry. They already made MVP and were listed on two exchanges - IDEX and crex24. I think it worth to invest.
The problem is that most ICO do not have any product at all. They suggest buying tokens, which are then not traded on the exchange, so you can not sell them. Today, in most cases, ICO is a fraud.