GoldCoaster was second hand, and until ST opens, it would have to be regarded as Dreamworld's flagship coaster right now...
I don't think there's anything wrong with second hand if the ride is being removed for progress reasons rather than maintenance or issues.
Given how Cedar announced the closure, it's safe to say the removal is for progress. WT probably has some life left in it, and would probably fit well into the old TOT footprint (pure guess), especially given the power requirements - but overall while it's probably got a solid decade left in it, I think the propulsion system is the biggest issue and its unlikely Dreamworld would want to take on another power beast.
I'd love to see it, but agree its probably never going to happen.