I think it's an appalling prospect.
Not only are you erasing the woman who carried the baby for 9 months (and who my also have provided the egg), treating her like a carrier bag, you are writing her out of the child's life forever - so even if, in 20, 30, 40 years time s/he tries to find the person who gave birth to her, there will be no records. Anyone who works with adopted people, or people brought up in care will confirm that the need to know where they have come from is often overwhelming and all-consuming.
And frankly, I think there should be even more diligence about babies born to surrogates, especially if they are being handed over to two (or more) men. This is because the parents - male, female, heater, gay, bi - have not had the opportunity to develop a relationship with the baby during gestation. I think this will be a greater risk if sperm and egg are donated. No matter how much they want this baby in their family (and we'll assume it's for good reasons), a baby can be very hard work. A baby which has been snatched out of the womb and away from the arms of its mother is HIGHLY likely to be difficult to settle and perhaps feed.
We need to make sure that those babies are protected and the parents are supported if necessary. The baby must always come first. ALWAYS.