Ever attempted this before at a large company and had success with it? I think I can count four times so far in ~15 years where people attempted to rewrite something medium/large-scale from scratch around me, was a success once, although scope was drastically cut at the end so almost a stretch to call it a success.
Boom! emacs is the IDE now. Bonuses all around.
Whether it was successful or not is up for debate. It certainly was nowhere near as performant as the old system but probably 99% of features came across.