It's hard to say how Mark will be remembered, but as like has just happened to Richard Wright, we all die sometime.
Mark will be rememeberd of course as one of the greatest guitar players who has ever lived, the fact he taught himself to play, and that he is left handed but plays right handed guitar, also that he plays almost always with fingers, which is unusual for a rock player.
He will also be remembered as one of the worlds greatest songwriters, in the early days of DS and upto Brothers in Amrs, it was easy to just get carried away with his guitar playing, and not really consider the songwriting, but if you listen to the songs they are very well written aswell, not just the music but the words too, as a former paper reporter, he is very well read, spoken and literate, and his lyrics are always insightfull, full of true stories, about the world he sees, and his own life, although he doesn't get to personal.
He will also be remembered as a great session man, having played with some of the other worlds great musicians, always adding something to the recordings, with his unique guitar sound and approach to playing.
But perhaps the best thing he could be remembere for, is for being a genuine and kind man, in an industry that is so full of not nice people, and big heads, he stands heads and shoulders above most of them.
He is a true star, a dying breed, not just someone of a reality TV show who thinks they are a star.