Lichen Spacemen?

As a Zoologist, I knew that Tardigrades (or 'Water bears') could survive the temperatures and cosmic radiation of space. I did not know until now, however, that Lichens (fungal/algal symbionts) were even tougher! Will it be much of a consolation for humans, if they manage to boil the planet, to know there might eventually be herds of giant tardigrades roaming the boundless fields of lichen? Only asking for a friend.