Bitcoin became a monetary game changer specifically as unified finance which is globally accepted for payment of goods or services with it decentralized potential which is self custodial to it users having miners to validate transactions on self moderation of what you decides about your funds without being centrally regulated like the traditional currencies.
Bitcoin is itself, and it does not need to unify global financial system. The world spins and needs diversification with many different options for people globally with freedom or no freedom by governmental controls, to choose what they can access and what they want to use. Option pools are different in different nations, as said with different freedom conditions, but by having diversification, it's helpful for people to try different things, fiat currencies, Bitcoin, altcoins, and realize through their experience that what is best in long term.
In long term, no doubt that Bitcoin is best (See ROI table).
In security, no doubt that Bitcoin is best (See How many confirmations are equivalent* to 6 Bitcoin confirmations?).
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