Lack of SVG export isn't due to wanting lock in, or even a question of priorities. I spent considerable time working with all the leading vector drawing programs and investigating their performance. The simple fact was that it couldn't work well. Even trivial drawings (20 lines) done with the pencil tool in Sketchology would cause Illustrator to lock up for hours and consume all available memory. Larger drawings would fail to open altogether.

Ultimately I think offering the feature would have been extremely misleading and frustrating for people. I'd rather cut a feature than ship a bad experience.