Mbo, such a pleasure to connect with another lapsed classical guitarist! I only play a little bit of classical now -- not well enough to be considered "serious" -- but I find that there are a lot of indirect applications for the principles I learned, regardless of the style I'm playing in. At least, keeping the concepts in mind (paying attention to how your posture affects your hand position, how certain kinds of right-hand attack can have a dramatic effect on tone, etc.) can help you work through difficulties you encounter wherever the muse happens to take you.

I think your next point -- learn everything you can, from wherever you can, and it's bound to help -- is right on the money. Now if only I could perfect that Pete Townshend windmill in the middle section of Recuerdos de la Alhambra...