How hard would it be for someone to build and IDE (with nice code browser, refactoring and all the smart stuff... like JetBrains products) on top of or incorporating an editor like Sublime or Textmate? I'd pay an arm and leg for IDEA or PyCharm with Sublime as the text editor (or something else with multiple cursors and all the "shiny" editor stuff), and the ability to launch either the full IDE or just the editor an…
Both try to dabble in eachother's realm, but the places where they shine should be inter-operable, not combative.