The problem with this is, I don't think they see a need. For larger companies, flagship designs are frequently meant to be break-even projects done to win respect for the company among the cognoscenti and no small amount of PR attention from the general public. AKG gave up competing in the high-end market -- or maybe it's better to think of the contemporary AKG as content to be ignored by people interested in nth-degree-of-refinement products and instead cater to the considerably larger market interested in headphones as fashion.
Headphone amplification has come a long way since the K1000 was issued, and it is considerably easier now to get an amp capable of driving inefficient, demanding phones like the K1000. So it might be even more popular now; I'd bet back in the late 80s people were buying them, plugging 'em into their home receivers, and giving up on them on the spot.
I suspect, though, this could backfire on them. The K1000 is over twenty years old, and reissuing it is an implicit admission that they've been dawdling. Ideally, they'd be able to come up with something even better.
The K1000 is probably the most well-known of AKG's flagships, but AKG have a history of idiosyncratic designs which were not always successful, but always interesting and accessible. It's also worth remembering that the open-air K1000 was preceded by Stax, Jeorg Jecklin's open-air designs for Peerless MB/MB Quart, et al; AKG weren't breaking new ground as much as refining the ear speaker concept in a particular way.
If I had my druthers, I'd rather see an updated version of their more practical (yet somewhat odd) products, like the
K340 hybrids. They wouldn't be flagships, but I'm more likely to use them regularly.