I think a box set would do very well, even more so if they include really rare and unheard stuff. Bob Dylan's bootleg series box set continues to be released in physical form, and has been stated the Pink Floyd box sets are great, and the fans are buying them. The other thing is that Mark would have never released anything like this before, so it would be big news, and he has many unreleased songs that fans are dying to hear, and lots of live stuff that could be also released. It could be great, we just have to hope whoever works on it does their research, it would be best to have someone like Guy involved as he has been the one constant for the majority of Mark's career, plus John Illsley could be involved for the early Dire Straits era.