Yeah, the issue is that DC looks at it more as Robin's 80th anniversary and not really Dick Grayson's 80th anniversary. So if/when they do anything for it the anniversary will be diffused between the other Robins, or even other sidekicks like they did for the 75th lol. It all goes back to the idea that Robin is the iconic name and not really Dick Grayson and Dick leaving the Robin name in the end hurt his character long term. Short term it is a nice story about Dick "growing up" and becoming a new hero, but his character never really got back to the same level he was as Robin and people in power, like a Didio, still view the character negatively for it too and used it as a reason to undermine him.
As for DC not wanting to put "top tier" creators on Nightwing it is something that DC has very much done and that is just fans responding to DC's actions. DC tends to use the Nightwing book to test out young talent. That is what we have seen over and over again, especially since the New 52. It is unfortunately looked at as a stepping stone book and I think once a property gets that kind of label it is tough to shake. Maybe a Snyder coming on could change the view of it, but I would just be surprised if it ever happened.