Hi Tim.
The only thing (except flip pancakes) that Moodle can't do is downgrade the database. So, in fact, you can't take the courses back.
However, we are within a breath (hours probably) of a beta version of 1.4, which will probably turn stable around the first of the month.
With things this close to the edge, you are probably safest holding tight and upgrading from the beta to the stable at that time. Moodle.org is run on the development version and you can see how amazingly stable it is (especially near the end of a development cycle).
Having said this, you are wise to want stable as soon as it comes out.
-Tom
Installing and upgrading help
Moving off the dev track
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