Being misguided is the theme of Nohr though? I mean the characters and siblings that you grew up with in the Dark Nation don't know of the supposed evil that's going on, and if you're required to drive a revolution within the castle walls (if you pick that version/side of the game), then I'd say the same could potentially happen with the Hoshidan side. I don't think it would undermine your route choice as such though? I mean logically thinking, to recruit someone from the enemy side (given that they're misguided and have no idea about what they're doing for Nohr), would be extremely difficult because not only do you have to prevent them from dying, but there's the convincing aspect too. :P
Edit - I forgot to say that by having recruitment levels that difficult would add a challenging aspect to the game (while abiding to FE traditions) and keeping your crucial decisions intact.
I'm not sure how it'll all play out in the game, and I'm really excited to see how it actually is! They might not have recruitment after all, and just leave it as a single route plus DLC (the darker, more depressing side). In my opinion though it'd leave a more interesting twist of reality in FE: If, supposing that they do implement recruitment options (and therefore more heart-wrenching choices to decide between).