The Ice House world we live in today is a relatively recent development. For most of earth's history our planet has been a Green House world.
The same conditions which led to the transition from a green house world to an ice house world still exist today.
Over the last 500,000 years we have been cycling between glacial cycles - where significant ice accumulates over portions of North America - and interglacial cycles which is what we have today.
There is zero evidence to suggest that if all things were equal we wouldn't continue to experience these glacial - interglacial cycles.
So only an idiot would try to discount the risk or probability of another ice age. An idiot.