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No real reason to change from the 9mm. Handguns are almost irrelevant in combat. The number of enemy KIA they account for is miniscule, so changing calibers now would be expensive and a logistical headache with little to no gain.
Having said that, the .45 is the best round for most of the rare circumstances you would need to use a handgun in, but the 9mm has a few things going for it. Increased capacity, range and penetration for instance.
I dont think .40 would be the best round for widespread military use because of the increased wear and tear it puts on guns and the fact its harder for some people to shoot well.
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