Neither is ideal but better that there be commercial activity rather than none on the site
Absolutely!, the only future for DTV is to move away from dependence on passenger revenue. As time runs on, then to remain attractive to airlines the airport is going to need ever greater amounts of investment which it is no longer possible to generate internally from passenger operations.
There are no outside investors / airlines with the resource to throw at DTV, particularly when there are more attractive propositions both to the North & South.
Airport management have already seen this in their continued pursuance of regional funding for industrial development. To become ecconomically sustainable then then DTV is going to have to operate more in the "airfield" as opposed to "airport" mode, the key being to maintain a runway suitable for purpose.
With such a setup and direction then DTV has a great deal to offer the North East region as a whole. It is down to the developer to get high profile industry names on board, so that others follow & a critical mass built up.
As for caravan storage parks then if nothing else it provides a visual endorsement that something has to change and soon. Care needs to be taken that caravan storage parks never become caravan parks for the homeless !