No problem.
- In some parts yet. More specifically if people are using spies in their tests which I assume more than a few do (see documentation here).
- In my personal opinion, yes, but I'm biased towards using the leading edge of technologies. Might be something to ask the Jasmine project to determine which version is most popular.
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The matchers should work just fine. I ported mine over to 2.0 without any issue. It's the people using the extension matchers and spies that will have issues. If you force them to upgrade to 2.0, Chutzpah might be causing them some pain. Maybe a question to ask you user base? Like in a survey or something?