Okay yeah. I envision a future code addition to the halving cycle that increases the division by another decimal. So every 4 years when the halving cuts new supply by half, the total supply is further divisible by another 10.
Discussion
The answer to that math equation is zero. Doesn’t matter if you keep reducing denomination. Negative sats flows eventually leads to zero.
Eventually you would be spending such small amounts that you wouldn't be spending Sats quicker than the value of the remaining stack grows in value, effectively never running out.