Can't see it happening in my lifetime.
As long as the private keys are randomly generated with proper entropy, I can't see if happening in the lifetime of any human being that will ever exist on the face of the earth.
I dont get it, you mean there is a chance the private key would be same?
Only if the wallet is using a faulty random number generator. As long as the private key is randomly generated with sufficient entropy, it won't ever happen.
If there is a bug in some wallet software, then it is possible that it will generate an insufficiently random number resulting in another copy of that software generating the same random number for someone else.