There are 4 UFA RHD's worth talking about: Klingberg, Subban, Stralman, and Stone.
Klingberg is in an entirely different tier and market than Holl. A team may look at Holl if they lose out on Klingberg, but they fill entirely different roles and it would make more sense for losing teams to look at Stralman or Subban instead.
Subban is worse than Holl and probably does not take less than one mill to go most places. He might do it here because he is from here and we are a Cup Contender, but that is about it. Like Klingberg, he kind of fills a different role than a Holl would too.
Stone is a #7 at best. Not comparable to Holl at all, and he only makes sense as a Holl replacement here because if we do use Sandin as Holl's replacement, we actually only need a #7.
Stralman is the only one who can maybe still compare to Holl, but he is old and has had a couple of rough years... And he too is not at the point where he is taking league minimum deals from anyone either.
People need to realize that the Leafs, themselves, see a lot of value in Holl and they do not need to trade him. You do not get guys like him at 2 mill very often, considering he would have easily received a contract north of 3 mill (and possibly even touching 4 mill) if he was on the open market this year.