Personally, for the player I'm responsible for, the MN HS system provides everything she'll ever need or want--we're lucky to have it so good.
My guess is that a post-grad program like the Crunch in the cities would serve a totally different group of players than the T-Breds.
T-Bred players have a definite MO, though some moms will argue about it: usually they're from high schools without a strong tradition in girls' hockey, or from smallish Class A schools who play in a league without stout competition. Many are from Western Wisconsin, where HS hockey isn't strong. You can throw in a couple who were simply not happy with the team they were playing for, be it the girls in their class or a coach. I know there have been girls who joined the T-Breds for the first time as a post-grad, but it is very rare.
I think the Crunch player is a totally different type: as a senior they for whatever reason didn't find a college situation to move into that they were comfortable with. They're willing to give it one more year of hard work to see if they can find something more to their liking.
The Twin Cities must have the highest concentration of girl hockey players in the country. Minnesota has more players by double than any other state. Therefore it makes sense that no stone will be left unturned concerning the options for the girls. U19B hockey, basically for HS-aged girls who don't want the 6-day commitment of a HS program, has grown exponentially in the last three or four years. Arenas have been built and varsity programs have popped up in places like Luverne, Sleepy Eye-Dassel-Cokato, and Windom (which before this year I'd have been certain didn't have a Boys' team much less Girls'). I'm willing to bet there are more Spring-Summer-Fall programs in the Twin Cities than there are Winter programs in all but a couple other states.
I don't know the logistics and finances of starting an operation like this (it sounds like you sure do), but it's pretty certain a program like this was going to get started eventually. Like with any other program in this land of many girls' hockey opportunities, it's Buyer Beware.