Talk of all these old Vituses falling apart is exagerrated and I think they can go on for a very long time and don't crumble to dust beneath you as you're going along.
I would generally agree with you. Some advice from owners and former owners has been along these lines: if you are a very large, powerful person on a large size frame, the Vitus may not be your bike.
Also, this is not the bicycle to ride as a commuter in the rain. Moisture in the joints can promote chemical reactions that have negative consequences.
My own, personal recommendation is to keep it nicely waxed. I hope I am right in saying that. It's what I do, anyway.
I bought my 979 from the original owner. It was raced around the globe in iron-man competitions — I guess before specialized mounts were made for these events. It shows no sign of coming apart or failing. I'm 75 to 80 Kilo and nowhere the sort of engine a competition rider is. And I have other machines I ride in the rain. I expect my 979 to last indefinitely.