Wolves are a bad analogy as they kill their prey. This is symbiosis
A symbiosis is an etablished fact we observe in nature, not something that is orchestrated by humans.
The cooperation between dogs and humans is the result of a coevolution. Working with dogs gave to humans a great advantage to survive (protecting the tribe, defending the cattle, helping to chase…). Humans had to be good with dogs, understood them and dogs had to be gentle enough, understood the human orders… But you can’t say it’s a symbiosis, the same as a… lichen, a composite organism that is the union of a algae and a fungi.
Krakoa is doing what the mutants want… now. But do the mutants really understand the needs of this “sentient organism”? Their relationship is rather recent.
“Strength is the lot of but a few privileged men; but austere perseverance, harsh and continuous, may be employed by the smallest of us and rarely fails of its purpose, for its silent power grows irresistibly greater with time.” Goethe
I don't see keeping mutants alive at ALL costs as a scenario, that would imply mutants want to die and stay dead, it's a thematic dead end not to mention unpalatable to the writers. The likely option is if it were evil, it would try to unify and subsume all mutantdom into one mutant (a reverse of Legion who fractures from within) creating one hivemind mutant of all Krakoans embodied in one entity with all of the constituent mutant powers. That is more plausible because that would require Krakoans to lose their individuality and basically life for this ultimate mutant 'adam/eve'. Seems something more up Sinister's alley but we'll have to wait and see.
Obviously at the moment one could use words like unexplained because the writers have not thought through the mechanics, but the telefloronic plantinel could serve as a template.If Krakoa is an independent biological organism it could do what terra Verde did but by crafting a human like host body that would be plant chimera with human cells, on top of that we have countless minds stored on some cerebros that could be siphoned into Krakoa either from the Magus infected flora from Doug touching the vegetation to simply explaining that since Krakoa has a communication language it could therefore stand to reason it can design complex code to write full on DNA and whatever brain wave signatures to mimic the minds on cerebro(s) This is fiction but there are certainly plausible avenues for Krakoa to do this if the writers are game to the concept.
Seems way too complicated.
It could be a hoot for Krakoa to develop the ability to grow 'mutant' bio-matter in it's own matrix, and, in a head-scratching sort of way, 'feed off of itself' and create a kind of internal homeostasis (still needing chemicals and proteins and mass/energy from other sources like water and sunlight, but no longer needing mutants to psychically parasitize), and kicking all of mutantkind off of itself and zapping off to the stars to seek out it's own destiny. "So long suckas!"