There are still a few classic rock bands that with the right marketing can sell albums by the bucketload, even with the download availability problem. Journey proved that you can still do it with Revelation and the 're-recorded' greatest hits package.
Don't underestimate the number of guitarists out there who'll follow Eddie Van Halen to the ends of the earth. Add in Jimmy Iovine and Interscope records and you could have a US Billboard number one album....if the quality is there.
Just for the record, Van Halen haven't put anything off. They haven't announced a release date that subsequently wasn't honoured or even officially confirmed that they're recording an album. That's down to the press and eager music fans.
What do you consider bucketload? Revelation had some good sales and I bought it, but I don't think it even sold a million copies in the U.S.(last I checked it was around 800,000). I am not sure of the worldwide total. And Eclipse had fewer sales.