Unlikely. That would require a 180 degree change of direction. Apple has decided that fewer ports in kind and number is what they're going to do, and I don't really see them responding to external feedback (and basically admitting to a mistake). They're too insular. Case in point: there have been loads complaints for half a decade about the current Mac Pro, and all we've seen so far is a souped up iMac and vague promises.
i think usb is one of the only cases where they haven't. and thunderbolt, sort of. apple loves their proprietary stuff though.
There are dongles to buy, but that seems to mostly have to do with such things as Thunderbolt and the ability to piggyback older legacy technologies on newer connectors.
Now if you were talking about the phone, I agree. But I also see the point -- micro USB is a terrible, terrible thing. As long as it's robust I would like to see the next phone ditch Lightning for USB-C, but I am otherwise much happier with Lightning connectors than I have ever been with micro USB.
Serious question, as I am not personally aware of such a thing.