I have a bit of a different take. Paul Westhead won the championship in 1980. Yes, he had Magic and Kareem, but I don't think that other teams were prepared for Westhead, or especially for Magic. We remember Pat Riley for Showtime, but Westhead hired Riley, and his championship was only the second in Los Angeles. West and Chamberlain won the same number as Westhead. Maybe it couldn't last--and it didn't--but they won once.
I'm cribbing from my brother here, but I don't think many other teams were that prepared for the Suns, Nash, or D'Antoni in 2005-05. The rest of the D'Antoni era may have played out exactly the same way, but without the Joe Johnson injury...the Suns may have beaten San Antonio, and San Antonio beat Detroit. I think the Suns could have, too. Detroit was a bit of a defensive anomaly in a reverse way, who (delightfully) destroyed the Lakers the year before. The year after? The Suns lose to the Mavs and the Pistons lose to the Heat (both 4-2 series).
We'd clearly look at the era a lot differently had the Suns even made the finals. They didn't. But in my opinion, not because it was predetermined.