Unless I am completely missing something, the report at the of the Hullavington Parish council minutes refers not only to the investment in the infrastructure of Buckley Barracks to secure it as a military facility for the foreseeable future, but also that there will be an additional unit based there 'in the next couple of years'.
The airfield itself has also been re-licensed for Heavy Drops so no plans to run that down then.
For clarification, the paragraph referring to Dysons expansion is contained within an overview of the activity of North Wilts Council as a whole, and relates to the ongoing (and extensive) expansion happening in Malmesbury right now.
Similar rumours were rife when Lyneham closed