People give Rosberg a hard time. I’m not sure how much better he could have done in the cars he’s driven. He was such a consistent points scorer at Williams and has carried that on at Mercedes. He’s looking at being 7th in the WDC for the third time in a row which is the best possible when you haven’t been in a McLaren/Ferrari/Red Bull/Brawn.
Williams and Jordan also had a rear wheel braking system in place when it was banned. I can’t see it being reintroduced because FIA don’t like to see too high cornering speeds. McLaren still like the idea though and stick a similar system on their road car.