Yeah that would have been nice, but it would have probably caused a shitstorm from people getting angry at the DVD not being released. There are some audio problems from the performance as well, with Bruce being cut out during 'Different World', so I don't know how much they'd be able to do about that.
The most disappointing thing about the Donnington show not being released on DVD is that Bruce fell over during Wrathchild - that would have been worth the £15 alone! I was actually there but I was too far back at the time and I'm too short to have seen that in the flesh.