It's crazy that we're talking about genetically re-engineering mammoths to help revitalize cold climates when we have such trouble preserving these elephant populations.
On one hand we have conservation, on the continent with the biggest poverty and governance issues. Wilderness, land-use & habitat issues are key issues. Outside of the artic, there just aren't many habits to support those kinds of far ranging species. African land tracts are unique.
Elsewhere we have rewilding, in its infancy. The US seems to be transitioning from one to the other. Europe is very slowly opening up to the idea.
Elsewhere we have some eccentric ideas about engineered hybrids using paleo-genetics, like the idea of bringing back mammoths. The ecological implications are complete unknowns. It's more of a genetics science project, with futuristic zoo implications. It's far from being a wilderness question at all. Resources don't compete.
Projects like the Russian Pleistocene Park don't really need mammoths. They've had a lot success using "closest available substitute" species instead of extinct ones. Maybe African or Asian elephants can (or can be bred to) tolerate that kind of cold and eat local plants.
It would be amazing to be able to see the megafauna in the wild though, along with protecting the wildlife we currently have.
I'd imagine a mammoth eating sedge in Siberia wouldn't be in as direct competition for resources as an elephant.