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If you mean Wagner's written ideas, I think they'd need to be more coherent to approach any kind of calcification. They amount more to the unshaped workings of a very great, quite erudite but largely undisciplined mind, on whatever subject happened to have caught his enthusiasm at that point. And, in some cases, he used that mind and that erudition simply to justify what seemed like clever insights -- his association of Nibelungen and Ghibellines, for example -- but were actually arrived at without real research or consideration, or even simply prejudices, many of them more or less inherited from his background. He never mastered the ability to discriminate and evaluate that he might have from a proper academic background.
But on the other hand, that might have made him a less good music-dramatist. Wagner's real ideas are those in his works, musical and dramatic. The rest are just the froth around the edges of his ego.