It seems that MyScript actually license out their technology for other developers to use
http://www.myscript.com/interactive-ink/
I'm no app developer, but it looks like it would be less work than expected to have a high quality handwriting environment within Evernote.
While OCR is useful with things exported from other apps, it's cumbersome to start a document in a handwriting app, edit it in Evernote then do a bit more writing in the handwriting app later. A solution like incorporating interactive ink into the Evernote editor would seemingly enable this, and make Evernote so powerful for me as a University student taking notes in different contexts.