Yeah, they haven't built a bare support coaster since.....2016. If what you said were true, they wouldn't have rebuilt Hulk. They'd be knee deep in a new Avengers ride right there. When the third gate gets built, I'd not be surprised at all to see an icon of the park be a big, bare support coaster.
There have been 'bare coasters' built since Hulk and Dragons were first made at other Universal Resorts..like for example.
- Flight of the Hippogriff (Japan and Hollywood); Japan - Vekoma, Hollywood - Mack
- Puss In Boots (there are sections where it is pretty much bare naked supports that can be clearly seen) in Singapore
- Hollywood Dream in Japan (B&M Hyper); can be seen bare naked through multiple parts of the Japanese park
I would say, it's not impossible that we see another bare naked coaster. You can't hide everything from the guest, even if they tried.