That's literally impossible for anyone to know. But the risk of her only wanting to have sex with other men, especially well-endowed men is definitely something you need to consider before going down this road. Regardless, if you do elect to proceed down this path, your role and duty as a cuckold is to support her decisions. She *may* decide that your penis is no longer adequate (for whatever reason), and may restrict the manner in which you're able to engage with her sexually in the future. If she makes that decision, as I said, you need to accept your role as a cuckold and deal with it. Your job is to ensure she is sexually satisfied, regardless of the form that takes. So it is not something you should enter into lightly.