By majority vote. Let's turn the rotation in the shiplab off next build. Aright?
Great, since we are all in agreement! Yay for democracy.
As droid summed it up so well:
IMO I wouldn't care if the rotate functionality got axed entirely.
I never use it. If I want to look at the model in a different angle I'd rotate it manually.
Stupid rotation is stupid. It's like hURP DURP I'M ROTATIIING.
If you want to look at ships rotating do so in the tech room, IMO the ship lab should be something for modders/mod makers to preview their models as rendered by the engine (something that an external program like PCS2 can't do), in which case the rotating display is entirely counterproductive and obtrusive when trying to look for errors.
Whereas the only arguments for rotation has been:
I don't really care one way or the other, but I'd say on. Looks pretty. 
Which clearly doesn't even count as a vote

and
I don't think this is worth implementing. Personally, I don't mind the rotation by default, and since disabling it is a two-process, it's not like it's taking a lot of time to do.
Which everyone seems to disagree on. It's a drag to be constantly turning it off manually.