If you could freeze all changes and had a near limitless supply of top tier talent, you MIGHT be able to rewrite the core SSA code base into a new language in 10-15 years.

During which time you would have delivered zero realized value.

Even IBM couldn’t rationalize this when I worked for them and we did this analysis for a very important but low profile government agency.

It’s the kind of proposal only someone high on their own supply of bullshit could believe.