Earlier quoted context omitted.
Yes, but I imagine that other porn sites are going to block Utah as well. That being said, nothing's really going to change unless Utah bans VPNs as well.
Websites that already flaunt the law (typically on copyright, but also on adult content distribution) because they're not US-based, will continue to do so. Only US-based operations will go to the trouble of blocking Utah. Which means Utah citizens will likely resort to non-US, less-regulated sites, making everything worse (more extreme content, less protections for people appearing in content, etc etc).
Apparently not, as Pornhub is Canadian.