The major reason that will pave the way for bitcoin to become the global reserve asset is the fact that Bitcoin has a fixed calculating supply of 21 million Bitcoin which can not be added and this makes the currency immune to inflation.
I don’t think that Bitcoin is becoming a global reserve any time soon, there are some countries that doesn’t accept it, and we are yet to know if it’s going to be accepted worldwide. It is not just about being worth a million dollar per Bitcoin, there is a lot more that goes into being a global reserve. But, whether it’s a global reserve or not, that’s not what matters, there is something that matters more than that, and it’s all about whether you’re benefiting from it. If you’re not benefiting from something ,then no matter what it is, it’s of no use to you. So, I don’t really look at all that being a global reserve and the rest of them, as long as it’s working for me, then I’m going for it.