Seriously? How on Earth would a Raptor ever be the right fit for the park? If VR went ahead with something like that, it'd be a complete misread of their target demographic. SW has always positioned itself as a family park and they've endured for more than 50 years because of it. Obviously, they had the Sea Viper there for a long time (tame and antiquated by modern standards), but I think the addition of Leviathan plus two decent flats more than fills that niche.
I'll say it time and time again, as an enthusiast, I'd love to see more cutting-edge, extreme rides to come to Australia, but they need to be positioned in the right place at the right time. Would MW benefit from another big coaster in the not-too-distant future? Absolutely, build your Raptor there, minding they'd probably benefit more from another show, dark ride or water ride first. DW? Same story, build a new water ride as a matter of urgency and then go for another coaster.
If I had the big golden key to SW, on the Vikings' site I'd probably do some kind of walk-through attraction, a smaller themed area with a couple of good flats, or even a modern flume ride a la Phantasialand.