You make it sound like finding a new #1 is an easy thing to do. Why don't you ask the Oilers or the Leafs how that's gone for the last decade
Fact is, this league wildly overvalues goaltending. In terms of supply and demand it shouldn't be that hard to find good goaltending when you have hundreds to choose from and only two spots to fill on the roster. Sure, when you find a guy like Carey Price or Pekka Rinne, you lock him down for the big money. Otherwise, getting a Martin Jones or Ben Bishop ain't that hard. Still confuses the hell out of me why Chicago threw such big money at Crawford. A guy like that is ridiculously easy to replace.
Now, all that said, I don't necessarily think Varly should be traded, but I do think he's a bit overpaid, because frankly I think a lot of the league's top goalies are overpaid. Again, the only ones IMO who should be commanding franchise-level deals are Lundqvist, Price, and Rinne. Those are the only three I'd call "elite." The rest range from very good to average.
On a side note, I don't know if there's a single team who's made dumber decisions with goaltenders than Philly. They're obviously prone to panic deals and knee-jerk reactions, but they seem even moreso with the guy between the pipes. If they had just stuck with Bobrovsky or gotten him a better coach they'd be fine right now.
And IMO there's where the REAL investment should be--your goaltending coach. He's the guy who develops them, evaluates them, refines their techniques. Roy's best move so far was bringing in Allaire. That position is vital to the success of any organization, fail in that area and it won't matter how much one pays to bring in goaltending.