I have no pony in this race...my kids are all grown up and need their own seats. BUT...here's a concept for the airlines...you get a seat if you pay for a seat. Period. You want to bring a lap baby? Fine, but even if there are 43 seats open, you still have a lap baby. Of course, they could make an open seat available to lap baby families for a fee.
If you want to fly with a baby in your lap, that's your choice. BUT I heartily resent it when I paid for my seat, I paid for my kids' seats...but you get to plop your car seat down, into an empty seat and put your 'lap baby' in it? Now...you no longer have a lap baby, do you?
It gets tiring to see how many parents want that free seat. They book their lap baby, bring the car seat with them, and then start lobbying for an empty seat at the gate.
I'm not taking any issues with anyone here..but over on the Transportation Board, we see a lot of parents asking how to get an 'empty seat' when traveling with their lap babies.
Having flown 14 times with DS under 2...I'm okay with the bolded policy. If this were the policy I'd obviously have to choose which option works best for us. Right now we have the best of both worlds and I think it is incredibly generous of Southwest to allow us to use an open seat. However I wouldn't be upset if they changed their policy. Fact is, I abide by their policy and while their currently policy is very nice, the policy you propose is fair.
As for "lobbying" at the gate, well I guess these parents need to be educated. Here is how our conversations go:
At Checkin:
US: Is the flight full?
SW: Yes, today's flight is full.
US: Okay, thanks.
While gate checking the car seat and stroller:
US: Is the flight full?
SW: Full? Of course it is full (insert reason why I am stupid for even asking.)
US: Okay, thanks. (gate check sticker is applied to seat)
While boarding:
US: Is this a full flight?
SW: Actually, no, we have several seats. You are fine to take your seat on. US: Okay, thanks! (peels sticker off seat)
or
US: Is this a full flight?
SW: Yes, it is full.
US: Okay, thanks. (drops seat at the end of the jetway)
As you can see I don't lobby, all I do is ask if it is full. If I am told it is I say okay thanks and walk away. If I am told there are seats available I say okay thanks and get on the plane.
I ask at each stop because as it gets closer to flight time things change. Maybe there were 4 seats available when I checked in but they consider that full just in case a last minute or standby person comes. But if no one comes by the time we board they may let us use one of those 4 seats. Or maybe there is a late cancellation. Or maybe at the last minute another flight is cancelled so they have to overbook our flight. It can go both ways.
But again, there is no trick to "getting a free seat." It is their policy so just ask. If they say no, move on. If they say yes, bring your seat on. Simple as that.