Well the thing is we have centuries to get our eggs in other baskets without changing the probability of a ELE much at all. Its on the order of once every 10's of millions of years. And no not having one for a while does not put the probability up. And even then these events are sterilization events, and anything less than that is unlikely to wipe out homo sapiens.
Right now the space station has cost us more than $100B, and for what? Even Apollo? Where is my return on investment, and no i don't mean money, I mean scientific return.
We are a tool making species. Use the right tool. Meat bags is not the right tool.