That would be nice, and people were asking for that for a long time now, even before AS Macs.
Better yet, maybe Apple release a 27" or 30" iMac with matching monitor.
Even better yet, maybe Apple bring back the Target Display Mode that was on the Late 2009 to Mid 2010 27" iMacs, and the Mid 2011 to Early 2014 iMacs, enabling iMacs to be used as external monitors.
The Late 2009 to Mid 2010 27" iMacs could be used as external monitors to non-Apple equipment, but after the TB iMacs were released (Mid 2011 to Early 2014), TDM only worked with other Macs with Thunderbolt.
TDM was removed with the 4k and 5K iMacs, which was reportedly because of a technical limitation with TB2, but could have came back with TB3 iMacs. I guess Apple didn't want people repurposing their older iMacs....
Probably won't happen, but maybe it could.