Generational: Howe, Orr, Gretzky, Lemiuex, Jagr, Lindros, Lidstrom, Crosby, McDavid
Generational prospects its Lemieux, Lindros, Crosby, McDavid for the modern era.
To be a generational player, I'd say you'd need a couple Harts and a very strong track record. I'd label Hasek a generational guy over Lidstrom and Jagr. Lidstrom is a great player but in no period of time was he deemed the best player in the league by either his peers or the writers following the game, he never even got nominated for the Hart. Great player who was consistently great, but doesn't pass the iconic label required to be generational in my mind. He gets grouped with the great defenders behind Orr, which consists of Potvin, Harvey, Robinson, Bourque etc.
Clear generational players are Gretzky, Lemieux, Orr, and Howe. Past that its debatable, but guys such as Beliveau, Ovi, Eddie Shore, Richard, Clarke, Mikita, Bobby Hull, etc enter the discussion before some of the guys you listed.
Matthews isn't a generational prospect and is unlikely to become a generational player. If you aren't the best prospect over a 5 to 10 year window, you aren't generational. McDavid goes above everyone else in recent history outside of Sid. It isn't even debatable. I don't think there is one draft outside of the Lindros and Crosby draft (maybe 2004) where you put McDavid in, and he isn't the first overall pick by atleast a 9/1 margin, and in most cases, it would be 10-0.