For what Holl and Kerfoot bring + their cap hit , you cant replace that at a better cap hit. Holl is liked by the coach and Kerfoot is a Swiss Army knife.
If the belief that Kerfoot is on the trade block, add his production to the list of support players that will not be back, Mikheyev (20 goals) , Kase (14 goals), Engvall (15 goals), Spezza (12 goals), Kerfoot (13 goals) .. that's 73 goals you need to replace with not alot of cap space , plus add a starter goalie... tough task.
I moved Simmonds, Kerfoot, Holl to the minors (fastest way to simulate the cap) there is some recapture on the cap when you move certain players to the minors, lets say the recapture its 2 mil. Lets say that the starting point is Bunting, Matthews, Marner, Tavares, Nylander, Kampf, Rielly, Brodie, Muz, Lilly, Gio, Kallgren, this would be approx 68 mil in cap space, you need to sign a 2nd line LW, a 3rd line Lw and a 3rd line RW, an entire 4th line, +Sandin and a starting goalie for $14.5 mil.
I'm not saying I know more than you because I don't, i feel it's tough to trade a 2nd pairing dman who makes 2 mil and a tweener forward who can play on any line , any position when asked. I would not be surprised to see all 3 gone but when I step back and look at those 3, Holl and Kerfoot are good value for the cap. With that said next season, Kerfoot is owed 2.7 mil in salary with a 3.5 mil cap hit, 1.95mil is a signing bonus which I think is paid July 1st and 750k in actual salary, Those players are attractive to poor teams like Arizona and Ottawa. Of the 3 I think Holl is the most likely to stay.