I just did the Goblin starting zone after a few years and I can't believe they wasted so much resources in a zone that you stay for 30 minutes. All that artwork and theme is never used again except in Azshara where there is nothing to do anyway.
So the theme is already there- even if it needs to be fleshed out to 2017 standards.
I would expand it out so it is not so goblin-centric. Perhaps you need to join a gang like in MSoG in hearthstone and you become hostile to the other 2 gangs while in the city.
I think they did a fantastic job with Suramar and that a light-hearted themed city would look great in WoW.