If I delete a theme from my queue, does that remove it for all?

I have just created a few new themes I thought were cool (check 'em out!):

• Soothing blue/green
• BlueBlackNWhite (I like the background on this one!)
  
• The Shining      (yes, based on the movie, similar to the one above but starring JACK!)

and since I can have only 5 themes, if I have to delete one of these to create or use new ones, does that also delete it from the entire chess.com system, or just from my queue but it stays in the system for all to use (even myself at a later date, if desired)?

"I have to delete one of these to create or use new ones, does that also delete it from the entire chess.com system"

Yes.  As the original author, when you delete your theme, it is wiped from the system.  Anyone using that theme will be reverted to the standard chess.com theme.