In 2003 Räikkönen was only 2 points shy of a WDC with a single win. I do think a championship in such circumstances is a possibility though the likeliness is pretty small.

In Hawthorn's case there were much fewer races in a season, so to put it into perspective with current almost 20 races, his wins have to be multiplied by 2 or 2.5.

Rosberg is a good case though and as mentioned, 1982 has another record - 11 winners. It was a very unique and messy season and to be honest, unlikely to be repeated. In some seasons we have got close to it (like 2008 or 2012), but I don't think current level and structure of competition enables us to see 5-7 almost evenly matched teams, who keep taking wins and points off each other all season. But that would be the only possibility, how we could possibly see a new record for the closeness of a season.