Does the tech work enough that it could handle the global market?
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I believe if Bitcoin has to go at global level for transactions then a layer 2 solution is mandatory to make that workable. The lightning network is going to be very beneficial if Bitcoin has to go for global transactions. The lightening network allows way more transactions then Bitcoin's own network and it doesn't get congested like Bitcoin network.
This is a very near solution right now but for me, we are still early, even Bitcoin itself is still not accessible to most people as day to day use like purchasing goods. So even if layer 2 (lightning network) will be the solution it will gonna take time to achieve it, it still needs to be accessible by most people and user-friendly.