Yes, there was a real Rockford reboot. It was made in 2010, starring Dermot Mulroney as Rockford. Beau Bridges was in it, too. Apparently it was terrible, and it never aired. I can't get a hold of it, though. I'd still like to see it, despite it likely being very bad.
Did you ever see the Rockford TV movies of the '90s? Those weren't very good, either. There were 8 of them -- the last of which being the worst by far (it even kicked around on the shelf for 2 years because the network didn't like it, either).
The weird thing was that most of the same people were involved in the Rockford TV movies. I think the writers just got rusty, and forgot what made the original series so great.
I wonder what Five-O would have been like if there were TV movies later on. I think Jack Lord had alienated too many people by the end of the series run for that to happen. I'm actually surprised it wasn't attempted, though. It was a beloved series, and there would have been a big appetite for TV movies featuring the Five-O gang in the '80s, even if they had to resurrect Chin.