Given the multiple options that are now opening up - and there are more yet to come - the main market demand will likely be met within a handful of months at most. Handheld MiSTer clones may well be an Aliexpress commodity within a year; open source designs are already in progress.

None of this helps with the frustration of months of hype followed by a small run sell-out! but it does suggest that the wait won't be terribly long, from here on out.