This makes sense, as Enter the Dragonfly and A Hero's Tail are both generally viewed as bad games by most fans and critics, and since there have already been rumors going around that a new Spyro game is in development, there is some merit to this idea.
Seeing as that Crash 4 essentially ignores all of the series' later sequels, fans can assume that a new Spyro game would also undo all of its most recent entries as well.
As previously stated, the unspoken rule has always been that whatever happens to Crash, the same happens to Spyro.