I doubt this. I mean, to begin with, on landing there is no way to "return to the gate". Prior to landing, it seems very plausible that a flight attendant would come by and ask me to take my sleeping baby out. I may make politely decline or make some movements to suggest I'm going to do that, without waking the baby up. It is possible that the flight attendant would then stand there until it actually happens. Maybe, but this seems unlikely to me. My experience is not, in fact, strict enforcement of all these silly rules. Some of them - tray tables and seat backs for instance - yes, others - seat belts and electronic devices for instance - no.
If the flight attendant did stand there, I would probably wait for awhile for them to decide to move on. I would certainly not become angry or loud or aggressive (definitely a bad move). If they really can't let it slide, I'd probably stop being stubborn at that point. But an initial polite "no" seems like a reasonable battle to pick even so.
On landing would be the less useful time to resist anyway because you've only got 15 minutes before you start a lot more activity that can easily wake them anyway. It's on takeoff that it's painful, since if baby is asleep they can sleep right through part of the flight.
> all these silly rules [tray tables and seat backs for instance, seat belts...]
Most of these rules are based in sound research, and were created to avoid repeats of things that exacerbated deadliness of previous air accidents. Calling them silly really makes one look like the sort of know-it-all who thinks that the whole aviation industry is dummies. Exactly the sort of person who bickers with FAs trying to inform you of the safety rules.
PS: I support the baby carriers myself. Argue it with the FAA, not with the FA on a plane.