Ooh, Felipe, you cynic! Next he'll be trying to suggest that David Icke isn't really the messiah and that Harold Camping's apocaliptic predictions aren't completely reliable!
In terms of what might have been, to be honest I've always had more sympathy with Rosberg's claim that he should have won the race, than with Massa's claim that the incident cost him the title. Massa's claim is based on imagining what would have happened if there had been no intentional crash and no safety car (i.e. Massa feels he would have won the race rather than being 13th, but there is no way of knowing that), whereas Rosberg's claim is based on what would have happened if the FIA had detected and dealt with the cheating in a timely fashion. As Rosberg crossed the line second, it is pretty hard to dispute the notion that, if the FIA found out what had happened on the day of the race, or maybe a week after the race, Renault would have been kicked out of the event and the victory would have been given to Rosberg, the highest placed finisher who wasn't cheating.
At the end of the day, safety cars happen, for all sorts of reasons, and Ferrari reacted to it by panicking and botching a pitstop, whereas Mclaren got their pitstops right. That's one of the reasons the WDC eluded them that year. There are other reasons, too, some to do with luck (if the heavy rain held off another 45 seconds at Interlagos...), some to do with Felipe not doing the perfect weekend, some to do with the pitcrew. It doesn't make sense to blame Renault because although the safety car hindered Ferrari, it hindered Mclaren too, but Mclaren still picked up a podium for Hamilton because they didn't make a mistake in the pits.