Has Philosophy over stepped it's boundaries?

[dissily mordentroge]

Because how we think is absolutely critical to our survival.

That's true - but guiding survival isn't the purpose of philosophy either.

Then what is the central purpose of philosophy?
A reading of the French de-constructionists has me thinking the authors imagine it's purpose is to turn the discipline into an incomprehensible and meaningless word salad drowned in a pathetic attempt at imposing a 'style' onto it. I'm not forgetting here however that in times past the definition and scope of what was termed philosophy was far wider than today's.