I see what your getting at but there is a cost associated with making moves and getting players out of here who don't fit...salary retention, losing draft picks etc... Also who are ya gonna call up? It's not like anyone is being blocked in the ahl at the moment.
Well, let's go with some hypotheticals. Say we trade Risto to Toronto. They'll need to move salary to fit him, so let's go with Risto for David Kampf, Nick Robertson, and some picks. Then Laughton to, IDK, Columbus. They've got all the cap space in the world, so let's go with that being picks only. EJ for a 7th to I don't care where, I've seen Montreal fans ask about DLo before, so ship him off there for nothing, and Hathaway, let's say back to Washington for Eller and a pick.
Now, that's 5 guys out, 3 back, so we open two spots, Kampf is the only salary sticking around, and we have something like this:
Foerster-Cates-Brink
Kuzmenko-Couturier-Michkov
Tippett-Poehling-Konecny
Robertson-Eller-Pelletier
Kampf
Sanheim-York
Seeler-Drysdale
Andrae-Zamula
Ginning or Grans
Ersson
Fedotov
So, looks like I did my math wrong, because I forgot about Kuzmenko and Pelletier. Once Poehling and Tippett are healthy again, we actually end up sending down Gaucher and Abols in this scenario, and opening a single spot for Ginning or Grans. Could potentially waive Kampf and bring Abols or Lycksell back.
In this world, Robertson is a "let's see if he fits" pickup who can be let go if he doesn't, Eller expires at the end of the year, Kampf is the only one sticking around, and he makes half what Risto did, so he's basically salary retention on Risto.