There are good algorithms to rebuild the missing lines without aliasing.

The decision to do it well will be more related to market strategies, give to the low budget people a good hdr image or keep the aliasing free image for expensive cameras.

the 24 megapixel sensor is 6000 x 4000. If they crop the video recording to 5760 x 3240 each exposure will be 5760 x 1620. 5760 is 1920 x 3 and 1620 is 1080 x 1.5, this resolution in a full sensor readout is good maths for a good reconstruction.

if they build a sensor with 33 megapixels so they can do 7680 x 4230 pixels for video recording and each exposure will be 7680 x 2160 enough for 4k hdr or even 8k hdr, but I do not believe they will do this now, maybe in the future.

in doom9 forum they have the QTGMC deinterlace which proves that a aliasing free reconstruction is possible. they just need to be willing to do it, with a powerfull processor in the camera with theys own algorithms, not the QTGMC because it is slow processing.