Mark is primarily a songwriter and also a gifted guitarist. A songwriter is looking at the world. He observes and looks closer than most of us do. This is his destiny.
As long as our world is turning and Mark's fingers are moving, he is compelled to write everything down and turn it into a good song, just as he has been doing for almost 50 years.
His guitar playing became secondary to him so many years ago and if one day he hangs the Les Pauls & Co. on the wall and only plays the acoustic, that's fine with me too.
I think the only things that are important to him at the moment are good lyrics and a nice melody. In this respect he is in a class of his own.
I really don't see any reason to stop!