Or maybe the new Industrial Estate will be like the many plans for a Cargo Village that have been championed before; in other words, don't hold your breath.
Why would anyone think that building a Cargo centre and maintenance facility at DTV would invigorate the airport? There has to be demand BEFORE you build these things. Airlines want a maintenance base where they operate from (based operator?, err no.); stand alone maintenance companies will go where grant aid is best (not your area at the moment), or where there are lots of aeroplanes (sorry DTV).
We've been down the cargo line on this thread before; NCL, LBA and MAN have the air cargo market sorted; LBA and NCL truck far more than they fly anyway. To the best of my knowledge none of the courier operators are looking for a new UK hub so the likelihood of anything of any size dropping in at DTV is, at best, a long shot.
Maybe a multi functional site with many revenue streams will allow for the continuation of a few of the site users to use that big strip of tarmac. There are several airports around the country where non-aviation revenue streams make the airport operation, as a whole, a viable option.