A good summary, particularly the bit about 'Wimbledon' always having poor support, both historically and now. I remember their famous win against Liverpool in the FA Cup Final. Wimbledon had the usual 30,000-ish allocation at Wembley but only a few thousand of their fans were present (exact numbers not recorded), the rest of the tickets 'disappearing' into the hands of Reds.
That said, the MK football project has stalled recently. I lived there for 20+ years, watching the whole thing develop from the 5,500 capacity National Hockey Stadium to the super modern stadium:mk. Official crowds average around 10,000, but bums on seats are probably half that. Many tickets sold very cheaply or given away to local children.
Winkelman's idea was for children whose parents followed Arsenal/Liverpool/Man Utd etc to grow up watching the Dons, and for a while it succeeded. Lots of kids in Dons kit around the shopping centre and parents prepared to take them to watch football in a safe, comfortable environment. But those numbers have dropped off and future support is not guaranteed.
Winkelman cares very little about that. MK Dons ticket sales are a small part of his income. He owns the neighbouring cinema / restaurant complex and MK1 shopping park, Hilton DoubleTree pay rent for their hotel built into the stadium, and miscellaneous concerts, rugby matches and conventions add to his pocket.