Can't quite say it should have been run twice already, but I voted Absolutely. I am surprised to see that it has never been run, however. I think a possible (additional) reasoning in the "slowing down" of MULE sales has been due to the steels as of late being quite a bit too similar to justify the expenditure, especially when considering all of the sales that took place recently. I think adding in a lesser alloyed steel in the mix every-other release might add a level of freshness in keeping interest to a wider audience. The project should please regular folks, as well as AFIs alike. There has been enough interest in lesser alloyed steels to justify at least a half run (~500-800 pieces).
I agree with you that the slowdown in MULE sales may be due to the fact that they have become quite similar lately. A2 will be a welcome addition to the MULE range as it will be a different and interesting steel to test.