Closing down all up and coming ICOs is no the best solution. There are very good projects emerging despite the tonnes of scam projects in the crypto world. I believe strict regulations of ICOs and strict KYC processes( applied to project managers) can help nip the scam projects in the bud.
the most likely outcome may well be ICOs being fully regulated which would be enough to scare off the scammers and crappy projects. in theory an ICO is a valid route, but the way it's done now is so rancid that it won't be permitted to continue.
i expect we'll see fully approved ICOs made available to major investors and the shit will continue to stink away in the shadows, but the days of mass publicity attracting hundreds of millions from random morons are coming to an end.