Unless Ms wants to dive right back into the red due to production costs I doubt they're gonna be stuffing 500 GB drives in - not unless they switch from laptop to desktop drives, but wouldn't that need a console re-design?
Besides, they clearly want something on the cheaper end but are getting flack over Arcade lack of HDD so a version with 40 or 60 GB actually makes some sense.
Try to be reasonable... its easier than you think...