Seems many readers are confusing Bitcoin with this thread. Bitcoin can never become a reserve currency, because the $200+ trillion of global wealth is not going to be placed in a speculative investment. (Stop with your fantasies about scaling over time, you don't have a clue about reality)
Large capitalists are conservative. They want safety of capital firstmost, then a steady average ROI.
There will never exist such as a thing as a single crypto-currency that is decentralized. It can't exist. Bitcoin is not decentralized.
True decentralization will only come from multiple competing currencies, thus of course these can never be the reserve currency.
My thesis is that the Knowledge Age (we are leaving the Industrial Age) reduces the demand for stored monetary capital and increases the demand for stored knowledge capital. The Industrial Age (which is moving towards 0 or negative profit margins in China) required large amounts of fixed capital investment, thus a high demand for stored monetary capital. The factory worker and factory engineer are economically insignificant compared to the NAV capital costs of the factory infrastructure.
Whereas the high profit margins are moving towards the knowledge production sector (software programming, marketing, etc). The Industrial Age is dying economically and along with it will die the demand for stored money. The larger the capital, the less effectively one will be able to invest it with a positve ROI.
Thus we don't need crypto-currency to be a reserve currency. Let the oligarchs (and the socialist sheeople/masses) have their reserve currency and enslaved nation-state governments. That is all part of the process of that paradigm dying.
The Knowledge Age will rise with competing crypto-currencies.
Bitcoin will not "winner take all".
I guarantee you that.