I guess that 'everlasting' fire will burn on without inhabitants then.
Nope...people will burn up, be reduced to ash and stubble.
Mal_4:1 "For behold, the day is coming, Burning like an oven, And all the proud, yes, all who do wickedly will be stubble. And the day which is coming shall burn them up," Says the LORD of hosts, "That will leave them neither root nor branch.
Joh 15:6 If anyone does not abide in Me, he is cast out as a branch and is withered; and they gather them and throw them into the fire, and they are burned.
But according to Jesus the everlasting fire is actually prepared for Satan and his demons:
Mat 25:41 "Then He will also say to those on the left hand, 'Depart from Me, you cursed, into the everlasting fire prepared for the devil and his angels: