That means it it legalized and Government will taxes cryptocurrency investors on heavy taxes and also give stick regulations that will be in favor of them.But it will also reduce scam ICO.
I don't think the imposition of tax after the governments accept crypto will be the problem for crypto users because most of crypto users are already paying taxes on the secular jobs. Although the regulations will check the scam ICOs and eliminate the FUD in some investors, cryptocurrency will cease to be decentralized even though the underlining technology is decentralized. The government will manipulate it and control it just as the fiat. Where then will lie the difference between fiat and cryptocurrency?