We don't have to get rid of the concept of a mother, because under the Law Commission reforms the purchasers (of whatever sex) would be the legal parents from birth. A child doesn't legally have to have a mother - eg in a male same sex adoption or a single male adopter, the child legally doesn't have a mother once the adoption order is made.
The Law Commission reforms to surrogacy are very clearly about making the process better for the purchasers. The link I posted isn't about the early days of surrogacy, it's the current direction of travel - the woman who grows and births the child having no legal relationship to it from birth. The previous set up is as with any child, the woman who gives birth has PR automatically, and it has to be given up by her or taken away by a court.
It's very clear the Law Commission wants to make surrogacy easier for the purchasers, and even disregarded the responses to the consultation which were against legal surrogacy at all. It's like having a consultation about whether we should have the death penalty by hanging or firing squad, and ignoring everyone who says 'no we shouldn't have the death penalty at all '.
It's much like the theft of women's rights to single sex spaces. Do you think we should allow this group of males to count as women, or this group? Shall we allow the sale of babies this way, or this way? with no option to voice that no, none of them. Two different fronts in the same war on women.
Edited typo