>I do believe that information gained from an excavation at a place such as East Kennet would be a valuable addition to our understanding of these structures and their place in pre-history.

It is full of bodies and bone pieces and odd ritual things we don't understand just like WKLB and many other barrows plundered in the area over the last 150 years.
What on earth do you think it could tell us that would be new and groundbreaking?
Would it be worth loosing our last ancient ancestors burial place in Avebury for a smattering of new knowledge?
PeteG
("We knew the bones to be ancient as they shattered when we threw them" Colt-Hoare at Overton Barrows)