Quick workaround I found. If you look at the greyed-out link you'll see the URL has an '&deprecated' parameter. If you remove that you can still get to all of the greyed out links, at least for now.
I hope Google isn't just going to dump this functionality. We rely on Datastore Admin to manage our backups. We also use the bulk entity delete quite often. As far as I can see neither of these are possible in the new Developers Console.
In general, to be honest I also just find the old Developers Console much more pleasant to use.