> Are Cursor and Windsurf going to ask plugin devs to push to their own plugin stores in addition to VS Code's?

They should and probably will soon, and if I were them I'd even consider giving plugin devs a cut of their paying customer subs if MS gets competitive about it.

> but customers will flee quickly if they lose access to all the proprietary plugins and to the broader ecosystem.

Agentic AI coding is more important to customers than VSCode's extension ecosystem. VSCode is who has to worry in this equation unless they ship the same tools in the next few months and heavily subsidize them.