I don't know if it even matters if its good for Bitcoin or not really, because at the end of the day Bitcoin is a deflationary technology and this beast cannot be put back into the box. To me that fact alone means nothing can stop Bitcoin, only influence it. In the short term we may suffer attempts to stop Bitcoin and an ETF could allow institutions to control the price but at the end of the day it is no sweat off my back. I don't worry about what's good for Bitcoin as much as I do about how Bitcoin can be good for me.