I don't see how GPS can be incorporated into PPL training without making installation mandatory in at least one plane per school, which they will resist fiercely.
Have to agree with that! Nail, head etc.
My guess is that say 10-20 years hence, when most of today's spamcan fleet has been scrapped, GPS will be common in the training fleet and this will enable the modernisation.
Not so sure here, though - it is entirely possible that even with glass cockpits, the student will be told to "ignore all that pretty stuff in the middle, all you need to look at is these old instruments around the edges..."
SD