I'm not too sure about that character. There was this section in the Book of Harmony with Q & A with Lauren Faust-CrazyGirl17 said:Still wish certain characters would get some of that.... *COUGH*DiamondTiara*COUGH*
"I think there's a double-edged sword to reforming villains. It's good to see them come around, because it shows us that people can change and that if you find yourself making a mistake, you yourself can change and can be forgiven. However, I do also feel it's actually important to some villains remain villainous. Unfortunately, in this world, we run into people who will continue to hurt us no matter much much kindness we show them. It's realistic to show that this can happen and that it best to cut abusive people out of our lives- like Rainbow Dash did to Gilda.
Ok that properly referring to villains like Tirek and Cipher Bill but it won't suprised me if Diamond Tiara remain as a bully like the olde sterotypical bullies characters in the 80's and 90's.
Still that book was published before season 4 came out and who knows, the writers can still proved me wrong in the recent episodes these days. Also this rumours could be true about Taira involvement in season 5.
Lastly yes, Steven Universe has been good lately despite it was lackluster when it first started.
EDIT- Three months is not so bad, I kind of find suprising that they release rest of Steven Universe (well except for the last two) episode everyday last week!!