Serious question - won't the polar bears come on land so-to-speak and invade/disrupt existing ecosystems? I wouldn't think an apex predator would just roll over

Serious question - won't the polar bears come on land so-to-speak and invade/disrupt existing ecosystems? I wouldn't think an apex predator would just roll over and die, instead I'd think they'll go elsewhere and wreak havoc. But I could definitely be wrong.