I'm just the opposite... I love the 333 storyline. Anytime Gary has a storyline, I think it's an all around win situation. I like that it's just a touch in each episode, rather than something that eats up a lot of screen time. I love the understatedness of the arc and the fact that Gary can do so much with just a look and a gesture.
If the last episode in the arc is moved up, the only thing that really tells us is that the episode that was skipped had no continuity in it at all. Which would be a shame, because the writers have done a fine job of fitting it in without disrupting the main stories of each episode. I think that "Boo" was a perfect example of that.
As much as I loved RSRD, I am only 'meh' about a possible Danny arc. I'm not thrilled with Emo!Danny and would hate to see him revert back to what he was in OTJ.
On the other hand, it would be interesting to see how it would be handled by the department. What with Mac's "vigilante" actions with Dobson last season and now his 333 storyline, I wonder how the department would handle Danny's emotional actions. Danny could be much more easily disciplined than Mac and the upper brass could make an example out of him.
If TPTB had sketched out a big arc for Danny and if, with the writer's strike, they don't want to leave it on a big emotional cliffhanger... they may decide to wrap it up quickly. That actually could be a reason for the moving of episode 9 -- perhaps it has the potential to be reworked (without rewriting that would require a WGA writer) to make a bookend to the story.