Further to Boba Fett's question, with regards to H&W, when TQ was first proposed, they had a 100 year plan as it was explained to me, whereby the entirety of Queen's Island was developed, including a lot of where H&W currently operates from. The dry dock was shown as a large marina, with the two cranes retained over it. This caused a bit of a stir, as H&W was obviously very much a fully operational business. Of course it wasn't a plan, just some architects doodle.
Anyway, as long as H&W is operating, TQ won't encroach on their land, unless they decide to sell any of it. And it's not like TQ will be running out of space any time soon, seeing as it is running miles behind their original phasing schedule.
The Titanic slipway was obviously proposed to be a bit more polished than it currently is, but i doubt that will happen until any development proposed around it gets going. It was claimed they decided to do a more stripped back slipway to give it more of a feel as to how they would have been back in the day, but that seemed like corporate waffle for 'we ran out of money and/or time'... The grass areas on one of the slipways are proportioned to represent the number of people lost in the various passenger classes on the Titanic.
Edit- the first post in this thread has the super duper long term plan showing H&W completely engulfed...