As it is using an unsigned 64 bit integer to store the number of Satoshi's any extension to this would not at all be trivial (it would require quite a lot of code to be reworked and a huge amount of testing) so I can't see any such thing happening for many, many years (if ever).

Understand that it affects the entire system in regards to the txs (memory, protocol and storage). Perhaps people might recall the amount of work that was done to solve the Y2K problem?

(am guessing most here are too young to know about that - but it resulted in huge numbers of retired COBOL programmers coming out of retirement to earn huge amounts for a few years)

Those that say "Bitcoin's 8 decimal places can easily be extended" do not understand software engineering.