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It's not impossible - FN is touting a conversion kit to do exactly that for the SCAR 17.
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There's "impossible" and there's "theoretically possible, but so much trouble there's no reason to bother."
I think you're right that a conversion kit is theoretically possible, but generally, gunmakers haven't bothered. The cost of such a kit would be very near or (more likely*) well in excess of the cost of an AR-15. While the SCAR was designed around that kind of quick change, the AR platform depended on an upper change (even faster, no rezeroing of optics since you'd just leave one on each upper), even though they didn't bother trying to get the two different lengths to play nice.
* I'm sure somebody could make a conversion kit. I don't think the market for them is big enough to produce them in volume, which means a much higher price. It would be easier to make a special upper, a different bolt carrier, and a magwell block. Still, that would probably run at least as much as a regular AR-15.