Are they going to add more themes?

[Maximumspeedpony]

Are they gonna add more themes to the game including themes for all the other rooms or is my theme workshop completely useless now?

[Mardoin69]

Completely useless. This game is abandoned (for the PC version.) The mobile version is still supported by Bethesda... so far. And, it's an updated version compared to ths one. The fact they updated it and didn't put out the update for the PC version is a tell-tale sign they've abandoned it. But, they actually stated they no longer support it. Anyway, yeah... just destroy the theme workshop once you've completed all the themes. Now you have room for some more storage or production.