It's not "just" a software change. It's a huge political and organizational issue. It has been proposed and agreed and disagreed and fought over for many years, with no plausible change in site.

Turns out, changing fundamental limits of a truly distributed system is actually very hard. True, not entirely for engineering reasons, but that makes it even worse - engineering can in principle be solved, people problems can be forever.

https://en.wikipedia.org/wiki/Bitcoin_scalability_problem#Bl...