It's not a big deal IMO.

The point is that the network cannot be DEBASED, which is increasing the supply unfairly. Simple increasing further division of the current network total value by adding a few zeros to every user's balance, and thus increasing the total units, every few years is not unfairly affecting anyone and only enhances usability as the value of each satoshi rises.

Also, we can even just keep the total network division as "21M" by leaving the software placed decimal at 1 / 21M of the total.

This debate is only controversial when a Satoshi is still a penny or less. Once a Satoshi becomes worth $1 (~2035~), $10 (~2038~), $100 (~2041~), and so on there will be no debate and consensus will be found to update Bitcoin. Allowing further division as Satoshi himself considered a possibility.