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I think they were just afraid of stepping on the same rakes again, and tried to make something new out of the old. If it weren't for the shortcomings of the 4th installment, we wouldn't have seen the 5th one as it is...
Unfortunately, there's no one left to step on them a second time...
And the Nival Interactive team was really afraid to do something completely new, because Ubisoft had ideas that could completely revolutionize the series.
In general, my opinion, formed over many years of playing, is this: only the company that originally created the game can continue a good series. Based on this, I'm afraid we won't see any more good Heroes games.