I don't see why that would be a problem, provided that the racing behind them is actually enjoyable. What we had for the second half of last year was Vettel walking it and a deeply uninteresting championship behind him, which is of course something to be avoided. But now we've got unreliable, twitchy cars that haven't yet been developed to perfection. We've got technical rules that (engine layout moaning aside, I've obviously lost that battle!) at the very least offer something rather more interesting than Happy Fun Time With Diffusers™. We've got rookies in (so far) good cars, experienced drivers in (so far) lesser ones. Hell, until the Ricciardo penalty wasn't that the first podium without a current or former champion on it for a few years?
If Rosberg goes on a string of easy wins and takes the title incredibly early, I won't feel short-changed. Sure, a battle for the title is a good thing - but it counts for ****-all if the actual racing is as fun to watch as cancer.