There's 2 ways to look at supply:

I think it's fair to say that no self-interested Bitcoiner would actually change #1 because it would be dilutive to their holdings... The second is a bit more insidious because people generally can't extrapolate or think strategically more than 5 minutes out.

Increasing base units would necessitate change on effectively every piece of Bitcoin software, one "harmless" hard fork to prove such a HF is possible then opens the door to others.

The increased divisibility might actually have the potential to address (idiotic) concerns around self-custodial attainability for mud farmers, but with unpredictable trade-offs around mining/mempool incentives, transaction fees, block subsidy, and switching costs.