Lots of things in this thread I felt like I wanted to comment on, so no quote since they were from so many. I apologize in advance for any lack of clarity as to what I'm talking about.
Like John and Nick stated, I have also thought Blackburn had more to offer than many. And like them I'm befuddled by the lack of results. As for the actual direction of the original post, the only reason I can see continuing to start him now because of being under contract next year is if there is some merit to the general argument that the best way for him to get right is by starting big league games. Given they are very unlikely to get to contention this year, do you use this year as work to get him better for next? I don't know if there IS any merit to that, but that's the only reason I can think of to keep going in the same lane.
Along the lines of results and what it might take and how far away he is from fixing anything, wasn't it just three months ago that he was lights out in spring training? So this is a question...having virtually no access to see spring training performances and the lack of statistics to properly measure them, is there anyone with the expertise here that actually WAS able to watch then to know what was different? Was it just luck or small-sample variation? Or was his sinker actually sinking and his breaking ball actually breaking and all of that? If he WAS throwing a good, heavy sinker just that recently, is that hope enough to think he could do it again relatively soon?
There was a comment about him being paid like a # 3 starter. I haven't looked it up, so this may be wrong, but I can't imagine the median or average for a starting pitcher in the big leagues is as low as what he's getting. More in general, there's a lot of hand-wringing (or worse) about his contract, but the dollars involved really weren't that enormous.
And finally, I can't imagine how big "a brass bowl" (that's a rhyme) one has to be to call someone a "piece of ****" or "garbage" behind the safety and anonymity of their keyboard because they aren't throwing a baseball as well as they'd like.