they should jettison most of the "non-show" related characters, and keep the drama with the core characters.
that's why the show is struggling.
you mention Leo?. . yeah. .he should be gone. So should Dev (adding nothing but looks to the show). And Angelica Huston's bar owner isn't really working that great.
I don't mind Julia's husband (tho he should be more involved in the idea that Tom is Julia's "work husband" and therefore feels their relationship is threatened, even if Tom is gay).
I'm hoping the new show-runner (from Gossip Girl) will get this thing back on track for next season. They were *really* lucky with an early renewal, as the ratings have TANKED, and no way would NBC have renewed if they knew a show following "the Voice" would bleed that many viewers (seriously, the Voice is hitting somewhere between 3.7 & 4.2 ratings (I think), and "Smash" is hitting ~1.9. ..that's a LOT of viewers to lose.