Good luck with that. I don't think any respectable nhl executive would project any of those players to fill a top 6 roll well. And that is basically what jvr and to some degree bozak are. They are 2nd liners playing on your 3rd line.
Like all teams , cheap talented depth is what is going to help you guys overcome losses like these, but if that is what you are depending on then things may be rough for you.
Agreed, none of the players listed are going to replace JVR's offense, and Kapanen is the only one who has a real shot of one day being as good of a player as JVR is now (in that a 50 point two-way winger is as good as a defensively irresponsible 60 point winger).
Next year, a 29 year old JVR is clearly better than Kapanen, Johnsson, Leivo, or other prospects will be. The Leafs will be taking a hit if they let him walk. But in 4-6 seasons, a 32-34 year old JVR could easily be worse. If he wants a 7 year deal, even worse.
I've mostly been on the "Leafs should re-sign JVR" train, as I'm convinced that the cap space can be found to give him a contract. But I think the best argument against the Leafs signing him is not that the cap space isn't there, but simply that he won't be worth the contract. Unfortunately, this argument also works against JVR signing on most other teams, unless they have a closing cup window.
That being said, if JVR is willing to sign for something below market rate, like 5.5x5, the Leafs should take that and run. He would be only slightly overpaid in the final year or two, and majorly underpaid at the beginning.