If that tweet is accurate, that means every TRU will have between 30 and 90 units. That is a very respectable number. It's possible they have more to give out since they never opened up online preorders, but there was evidence in that chain also that walmarts are getting at least 30 as well. They will still be selling out instantly, but those are at least respectable launch shipments. As others have pointed out, it all boils down to how well N does restocking quickly.
It will also be interesting to see if they let stores like gamestop do more pre orders once it turns out that there will be plenty of stock.