Christian,
Whilst there may be new instructors that are
better than the old guys because we are more up to date with the syllabus and more passionate and enthusiastic about it.
I would doubt it is that many, as lots of them are instructing to gain the hours before moving on, rather than being keen to instruct, any older instructors ARE there because they want to do it! Whilst not ALWAYS the case, they are still enthusiastic and up to date with the Syllabus (which IMHO has not changed
that much). What they do have that a newer instructor does not is a LOT more experience in both flying aircraft
and knowing how to put things over to students, especially those having difficulties.
I would agree that the more expensive schools are not
always those with the best instructors, but they do not all have YOU as an instructor, and on balance it will often be true.