Could it be that the feeling from Harry and some of Dudley's descendants be that there is something trying to push out those how have magic in them (and this include squibs)?
I must tell you that I had this idea WAY before Peter! ;-p Seriously! I wrote the previous sentence just after Harry learnt that others had the same feeling!
Hey! Could it be that the wards are made by pure-bloods, repulsing any magical able human not keyed in it, and as such, not pure-blood, because they are born out of the magical enclave? (any child born in the enclave could be keyed to the ward at birth...)
Or they transformed Hogwarts into a prison for Voldy, put the dementors there, and put the wards here to prevent magical users to free him...
The more time passes, the more questions there are!
About Harry last remark, how could he come back to his time, now that he have Kim? (And... I wonder if Kim will have felt the need to get back out of England, too...)
Author's response
Well, Your dead on as to what the wards are doing, but not necessarily correct in regards to what might be in there. I plan on beginning explanations pretty soon, but be patient, Harry's got to do some stuff first.
Rob