There will be always enough scam projects in crypto industry, because, as you said, even exchanges are not always seen obvious scams and are launching IEOs with them. The latest example was on Bittrex exchange.
On the contrary, it is even easier to steal money. In IEO now invest more. If a crook comes out on a well-known stock exchange, he can pick a big cash. Scammers can understand how to bypass the protection of exchanges and all we will have a new stream of fraud.