Is your question about whether there are enough monetary units in Bitcoin to support the global economy, or whether the value of the monetary units could ever grow enough?

If the former, there are more than enough sats to support 8 billion people, even with all the lost Bitcoin out there. Moreover, layer 2 solutions like Lightning allow for even individual sats to be further divided. I am currently playing on a Minecraft server with Lightning integration and we have millisat support.

If the latter, then there is no upper bound to the value of a Bitcoin, and therefore no limitation on the size of an economy it could support. The current market cap, expressed in USD or any other fiat currency is merely a representation of CURRENT demand, given that there is no supply elasticity. If and when demand rises, the perceived value of Bitcoin will rise with it until it eventually is seen as the only monetary asset of any real value. I imagine that before then we will have already ceased measuring its value in terms of other currency units.