Full Idea
We should remind ourselves the 'possible worlds' terminology can always be replaced by modal talk, such as "It is possible that…"
Gist of Idea
Instead of talking about possible worlds, we can always say "It is possible that.."
Source
Saul A. Kripke (Naming and Necessity preface [1980], p.15)
Book Reference
Kripke,Saul: 'Naming and Necessity' [Blackwell 1980], p.15
A Reaction
Coming from an originator of the possible worlds idea, this is a useful reminder that we don't have to get too excited about the ontological commitments involved. It may be just a 'way to talk', and hence a tool, rather than a truth about reality.