IMHO the question shouldn't be who are druids, but what is stonehenge.
So long as it's of unknown origin and built progressively by (many?) unknown people(s) then the best we can say about it today is that it's lost property and for want of any proof of ownership having been provided it belongs to everyone (and no-one). As such, no special burials thanks.
A call to have a burial plot there is a call for the introduction of a brand new concept into the law of property - "ownership by vague spiritual conviction".... Where will it end... much of the British museum contains lost property of identical status to Stonehenge.