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Do you think that world powers will allow to use XMR on their territory ?
They will alow if they control it. When switzland doesn want to release info about some money transfers then some sad men
comes to Switzland and they have convinced them to make changes i guess they had "good" arguments.
Today because of money loudering you have more restricted laws when it will be needed all XMR exchanges will go down
they will impose good law and they will shut it down.
XMR would exist p2p but you wont get any fiat window for it that will couse hard drop in volume.
If you want challenge a biggest superpowers and help terrorists with XMR you are on loose side.
And big Russia and China they don't want to much freedom for their people and XMR is problem for them too.
If XMR will be popular in terrorists group it will be shut down.
XMR cannot replace bitcoin but it is possible that it will gain a popularity as big as bitcoin. The darknet will be a catalyst of this. I speculate that XMR will later be considered the unofficial "official" currency of the darknet. That is a big market that will later amount to the billions of $. We will see drug cartels, terrorists, money launderers and other people who want complete privacy of their transactions to use XMR.
The problem is to get to fiat. That is where XMR and BTC will get their synergy. To use one, you have to use the other. I believe BTC will still be relevant because it will be the gateway and store of value coin for a long time together with XMR as the daily transaction coin that keeps everything you do with it private and secure.
In the future, the bitcoin can be the reserve currency of the digital world while the Monero can be the darknet currency.