when the waves will make investors rich?

Unfortunately never. It seems to me that this project will not bring us big profits and multiplying our capital by several times. This is a stable coin, which can give a small profit.
Imo if the current developments are rolling out like smart contracts etc, the price can increase multiply times.
$50 for 1 waves before the end of this year is still possible imo.
It's always a matter of adoption, last year ethereum went up big times because of the ICO bubble, which bad or good, it's a use case for ethereum, people bought loads of ETH to partecipate into ICOs
It's all about adoption. Adoption of developers, entrepreneurs, traders, users, investors more and more.
Unfortunately we are away from those so far IMO.