All the radiologists, doctors and surgeons I talked to were quite open about the fact that the erection returning could take months or years or could be never.
I made the decision and I'm quite happy with the results. I'm cancer free and physically recovered except for the erection thing. If the penis starts working in future then great, if it never does then so what.
There is being alive then there is being dead from cancer. I have had several friends and relatives die with AND from cancer it was never pretty nor easy.