Bump due to the news of DBZA being cancelled.
[youtube]vZy8D4B8LLs[/youtube]
The news broke a few days ago, though this video is probably the most thorough explanation. Tl;dw, a mix of being burnt out, awkward recording schedules and copyright problems from Toei were major factors into the series being cancelled.
It's disappointing that the Boo Arc won't get covered, though it makes sense with the comedy it had not offering much that DBZA could expand upon beyond pointing out the plot holes. It's good that the creators were able to realise the problem of bringing a project too far, given the later episodes of the Cell Arc (particularly the finale) were very much more akin to adding some polish to the original series more so than making a parody. Ultimately, they probably made the right call.