I don't know about this line of thinking. In a few years if Matthews is a Kopitar in Arizona, you might find yourself with a couple of older Jordan Eberle level players. Take the quality and upside and just roll with it.
This.
Chicago and LA have proven time and time again that you win in this league with a core of 5-6 unbelievable players and interchangeable support pieces. For example,
Chicago has Toews, Kane, Hossa, Keith, Seabrook that I consider as their core. LA has Kopitar, Doughty, Carter, Muzzin and Quick that I consider as their core. Lots of guys drop in and out, but those guys are absolutely foundational. For the Leafs then, we've got Nylander, Marner and Rielly who could aspire to be at that level. One of the three may not become that level of player, but it's a start. Adding a Matthews level talent gives you 4 core-level pieces. Like any other team, you hope guys step up, you hit a few homeruns, etc. Alternatively, trading Matthews for a Domi level talent just isn't smart. Matthews is as close to a sure-fire core piece as you can get.
I'm saying if we win the lotto, you take the #1C and run for the hills. Trading that for more lottery tickets is a smart strategy in the low-end of the 1st round, but just isn't intelligent with elite-level talents, hence why it rarely ever actually happens.