Bin judges' choice if they can't be trusted to pick anything half decent. Throw the decision to somebody who knows what the public wants to see.
Get rid of that (alleged) rule about nobody reprising dances done in the last 3 weeks of competition, because that TANKED this year's final. If we had that rule in previous years, we'd never have seen Caroline's charleston again, or (worst of all) Natalie Gumede would never have TOUCHED THE DIVINE in her AS.
Let the last-placed couple in the final do their couples' choice again. Relaxes the nerves, cuts down on the filler, and frankly if they let Lisa Snowdon do That Blimming Showdance after she's already been eliminated, then goddamit we should've gotten to see Sophie Ellis-Bextor's charleston again.
Lose Darcey and/or Len - neither are contributing anything worthwhile. Give Craig a note about contrivance, and just let Bruno work his magic.
Keep the VTs as a mix between comedy skits for some couples (who are in it more for the entertainment/fun factor) and training videos for others (who are in it more for the competition/long haul). Tells us more about the contestants' personalities that way, and it means their scriptwriter doesn't have to hammer out 15 threadbare skits every week.
I maintain that if they do it right, same-sex couples could work.
Jo and Oti did good work in the Christmas special, get them some good/decent partners next year. Please give Kevin an old dear, he's overdue a duffer and I think he'd enjoy it more than the others would (also he can spend all series feeling his 50s faux-nostalgia fantasy). Natalie to make it past Hallowe'en week this year as well.
Three couples in final, final two, no dance-off (didn't hurt series 8 or 9), two dances at top 6 (marathon dance the week before will ease them in), keep the backing dancers in Blackpool where there's space for them (they just drown most people out in Elstree), stop wardrobe from making people look Scott Mills levels of ridiculous (looking at you, Frankenrumba).