I’ve written about this somewhat in my discussion of Jon chapters.
While barring marriage goes along with the forswearing of lands and titles – since people have this stubborn inclination to try to pass wealth down through family lines – I think celibacy has been a long-term mistake, because it means that the Watch doesn’t naturally reproduce its own manpower.
If it was up to me, I’d embrace a somewhat Spartan model – communal reproduction, child-rearing, and education, all to build identification to the group as opposed to the fortunes of the individual family.