Final Cut Studio programs will no longer launch in macOS upon the release of High Sierra. It is the official end of FCP7.
When I first started writing for PremiumBeat in 2015, I mentioned that is was time for editors to stop cutting in Final Cut Pro 7. Well, for those still working in FCP7, a warning: Your time is officially running out.
In an email that just went out to Final Cut Pro users, it became official. You will no longer be able to launch FCP7 on a Mac with the latest OS, High Sierra.

Here is the official email from Apple:
Dear [Redacted]:
Our records show that you may be using applications included in Final Cut Studio. We wanted to share some important compatibility information about these applications and macOS High Sierra, which will be available this fall.
Older versions of Apple pro video applications — including applications in Final Cut Studio — will not launch on a computer running macOS High Sierra.
New versions of Apple pro video applications — including Final Cut Pro X, Motion 5, and Compressor 4 — are compatible with macOS High Sierra. You can purchase these applications on the Mac App Store.
You can learn about the transitioning from older versions of Final Cut Pro to Final Cut Pro X here.