There's a real problem, but also, isn't 550000 sats a bit too high to model ?
We know People have Plans, but starting at 100k would have made the point while being actually achievable reasonably soon.
The gap between a handful of US and Chinese sustained constellations adding up to 100k, and actually having 500k sats, is really really a big one to cross.
If you go too big, you lose the urgency factor.