A 25 yr old Matthews locked in long term for 13 million dollars would be one of the top 5 building blocks to start a team with in the league.
Bedard might be better, but that's a significant might. Remember, the nerd numbers have had one guy in the world better than Connor at any extended period of time in the last 4-5 years. If you're offered up one of the top 5 players in the world, in his early-mid prime, locked up long term for a kid who hasn't seen a single game in the league, you have to consider it and probably pull the trigger on it.
Imagine Ottawa being offered a 25 yr old Sergei Federov for Daigle and turning it down? I'm not saying Bedard is Daigle, but you have to plug the possibility of him not being a generational NHL'er into that math.
I also don't think his contract status (ELC, etc) really means much in the discussion. If he pans out, in 3 years he'll be making as much as Auston anway.
With all of that said, I think the Auston Matthews stuff is Toronto media hand wringing. Matthews will extend this summer.