I do not think the global regulation of bitcoin will kill bitcoin, it will be more reinforcing and more reliable, global regulation of bitcoin, is what the world is waiting for, to make bitcoin into a hot currency, and universally acceptable. See something that has a market market capitalization of more than 800B USD is considered to have involved many people from the market.You can not say it govt.Can leave a very popular thing like it is not regulated. Rule will come. Only if bitcoin can curb its way out of such norms will it only be said to be global currency or environment but yes it will have a very negative effect.