My argument is that the system as we have it is pretty good at doing what it needs to do; though it presents the risk of choking to death, the alternative designs presented are far more complicated and 'hardware heavy' than what they benefit the species in way of removing the choking hazard.
The counter arguments are that a system completely separating speech/breathing from eating would be ideal to such a degree as to warrant the excess hardware and all the complications that might come along with this.
Perhaps dolphins have a far more eloquent communication system that we have not even begun to grasp at this time, such as how we are now discovering specific whistles for individuals within the pod.
The dolphin system is not complex enough. We know this because their brains are not as complex as ours. If we relied on a system comparable to theirs, we'd be failing to communicate a huge amount of what we are capable of thinking.
A replacement system has to be able to achieve at least the same as the current system to be worth considering.
Remember, if we had our same intelligence and were raised with a different method of communication, such as was used in the past with types of clicking and gutteral noises, then this would be what we would see as the best method of communication because we would understand it.
But these systems aren't sufficient for us. Complex thought can only be transmitted through complex communication.
Breathing, communication, and eating without the danger inherent in the human design of choking.
But it can't just be any kind of communication; it has to be communication sufficient enough for carrying the complex thoughts of our complex brains.
The real question is why we would even need to use our lungs and move air in order to produce complex sound. The speakers in your car are not hooked up to an air compressor, are they? Why does speech even need to come through our mouths? Surely an intelligent designer who is supposedly all knowing and all powerful could have come up with an infinite number of better designs.