Oh, that's one I've always wanted to write more of, but those are some fiercely opinionated fandoms. I have a hard enough time mustering the courage to post new chapters of "Back Again, Harry". You'd think I'd be over my nerves by now! And it's been awhile since I've reread P&P. Next time I do, I'll have to think about this some more.

Anyway, when I was initially thinking about how magic might work in the Austen era with the landowning set, I just could not picture most of them sending their children away to Hogwarts for various reasons, to do with social and economic strata and family obligations and so on. Much easier to hire a tutor to teach them the bits they'll need, and make sure they meet only the right people and don't get ideas about magical careers, etc., etc. Especially in lines that (as I imply here) don't take magic into account when arranging marriages and thus end up with pretty mixed squib/magical children.

I have to admit when I was thinking about the odds of the girls marrying wizards when they didn't know the other families well enough that 'irregularities' of that sort would be obvoius, I picked Jane as the one in a nonmagical partnership because I thought she'd deal with it better. It seemed like not being able to use magic would be a mild inconvenience but no great hardship to her. They wouldn't have grown up in an all-magical household like the Weasleys, anyway; anyone that had much dealings with society probably wouldn't be able to, so any bobbles in Jane dealing with Bingley's household would probably just initially seem like her learning the differences of scale from her mother's.

Elizabeth, on the other hand... emotional as she is, it seemed like she'd feel her magic to be a much more integral part of her, and it would just increase her issues with romance. I hadn't worked out just where the plot of P&P would differ when I wrote this, but I figured she'd start picking up clues at Rosings-- Darcy would be more likely to relax and show hints there in the company of magical family (definitely Lady Catherine, probably Fitzwilliam, though Anne may be a squib) than at Bingley's.

With the tutor system, the House thing wouldn't really apply, unfortunately. (Which would make a neat way around the really limited number of children schooled at Hogwarts, actually; it's not that there are only that many wizards in the British Isles, or that no one else is powerful or rich enough to go, it's that there's a whole range of people between the "wizard culture only" and "muggleborn; jump in wholesale" categories that have their own ideas of how integral magic should be to their lives. Um. But if he had gone under the Hat.... I'd probably have put Darcy in Ravenclaw. (A Gryff would probably have spoken to Elizabeth sooner, a Slytherin wouldn't have misread her so badly, and Hufflepuff would have taught him better personal interaction skills, plus he's really pretty intelligent; just locked up in his own head). YMMV.