Felix has been playing really well of late. I hope it isn't just his typical indoor bump, but might be a step forward. I've long tempered my expectations about his upside, but I do still think he's got a chance of winning a Masters or two. Now that Ruud and Shelton have won Masters, among those currently without a big title, he's up there with De Minaur among my most likely next new big title winners. We're in an era where a solid player can go on a good run and win a Masters. We've seen guys like Carreno Busta, Coric, Popyrin, and now Vacherot win. FAA and De Minaur are better overall players than those guys.
On the other hand, I can see De Minaur getting "Nishikori-ed" and never winning a big title. Demon doesn't play in the Big Four era, so will have more opportunities. In theory. But he's now in the latter half of his 20s, and young guys are coming up.