I think NPC wingmen/crew would be a fine addition, but there is a difference between NPC and PC wingmen/crew, aside from the very obvious.
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The big thing that sticks out to me is that NPC wingmen/crew aren't people so they are not a finite commodity, so they are expendable, always available and relatively cheap (a friends time is worth more than a few credits because it is real beyond the virtual world). What ends up happening I guess, is that while PC wingmen will always be a premium and have a high cost (real time and availability), NPC wingmen quickly just become another module that you always have fitted.
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With a PC crew a player has to sacrifice having an entire ship in his wing to get the benefits of a single NPC crew member, but with NPC crew, that isn't the case. You cough up a few credits (high value perhaps to players in eagles and vipers, but negligible to people in big ships where they actually benefit anyway) and you get a close approximation of what a player would do (and if it isn't close enough then what's the point? We may as well just put blow up dolls in the seats if they aren't going to actually yield a substantial/competitive benefit).
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I don't think it's a balance issue so much as an issue of giving it value against other alternatives. If you introduce NPC wingmen, open or solo, nobody is going to forgo the benefits of having multiple ships with 3 NPC wingmen aboard to have 1/4 the ships with 3 PC wingmen aboard. It will become as mandatory to have NPC crew as it is to have guns at all, sure you can play without them (and some few people do) but statistically speaking, no one will, they won't be a gameplay option, they'll be a gameplay standard. And that regardless of mode and one that totally overrides PC wingmen because of the enhanced benefits they provide, especially in coordinated play (imagine gimbals unaffected by chaff in wing v wing combat....).
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I hope we see some implementation some day, but I also think there are more, and very big, considerations than just Open vs Solo. (I play in a very small private group or solo (on bad server days), 1 or 2 friends online with me about 1 time every week or two, usually some thousands of Ly away, just so you know where I am coming from on this).