I don't think they are coming back. Many "styles" come and go, or mutate in some way over time.
Kawasaki for awhile collaborated on some models with Suzuki, so I guess you can say they still had a hand in Suzuki bikes you mentioned.
But times change. Your last statement of course it true, you can say the same thing about alot of vehicle styles, 4 wheel or 2.
Remember the 1982 Honda 750 Super Sport? Although gone, you can see styling cues from that bike in others made today.
The metric "cuiser" bike was always just Japans way of attempting to appeal to the american market...which was really trying to capture the "image" of Harley Davidson style bikes planted in the mind of most potential owners.
I don't care what anyone says...they all in some way were in fact copying HD styling cues. Some of course more than others.
I'm glad you like the styling of the Vulcan 750. I did too...and picked it over the glut of bikes that looked more "Harelyesque" back in 2002 when I bought mine.
But then I liked my Yamaha RD 400 , my Kaw triples, and my 81 Secca...all of which are "lost" styling examples on their own.
But then, my tastes have changed a bit too. Today, this is what I am riding:
But again glad you are happy with what you ride.