We had the front of my wife's Camry wrapped with clear 3m when we bought it about 7 years ago. The clear was starting to yellow slightly on the hood and the adhesive was starting to creep from the edges leaving dirty lines. By now I figured it did it's job so I decided to remove it. 2 Hours just to remove the piece from the hood!
Yes, it's on really good after all that time. The film came off somewhat easy but the adhesive was another story. It was getting kind of hard and chalky. I had to let the adhesive remover soak then use a plastic scraper to gently scrape the adhesive off in layers. It was a sticky mess. My guess is it was dry because of the time. Her car does sit in the sun during work days.
The moral to my story is if it's on a long time, it will probably continue looking good but removal may be an issue. Some of the first 3m films would dry and crack. They would have to sanded off. I watched enough Youtube videos on it that I was somewhat scared. From what I understand, the cracking issue isn't a problem with the films made in the last 10 years.
I wouldn't leave the stuff on forever. Personally, I'd remove it after 8 years or so and maybe have a new wrap installed if I really liked it.