I really recommend the video in the article for anyone that wants to learn about some V8 internals, how they got to this point, and where it is headed.

They are replacing 3 JITs with an interpreter and a JIT which should improve speed, memory usage, and allow them to add new features faster, but the climb to that point really looks like a tough one.

Watching that talk it really sounds like they painted themselves into a corner with the complexity of fullcodegen, crankshaft, and turbofan. And the path they are taking out is really interesting. By introducing ignition they are adding on MORE complexity, but eventually when turbofan is well rounded enough and ignition is battle tested and improved, they are planning to drop fullcodegen and crankshaft and hook ignition straight to turboshaft making everything simpler, and hopefully faster!