I like the Red/Blue approach. Scenes play out differently enough to be significant. Mechanically it boils down to juggling 2 stats per character, which is easy. Even if sometimes red options are just "angry douche" rather than "aggressively flirty" that's fine, since the game doesn't really punish you for roleplaying and throwing in the occasional blue choice (or vice versa). You can still easily maintain the path you've picked.
Having a killswitch option of writing characters out of the story is great. Probably means there'll be some months with no new content for those of us who cut characters they don't care for, but that's alright. The great thing about this is that it allows the dev to have characters that play to very specific likes/fetishes, while those who don't care about them wont be impacted at all. Just make sure to have the killswitch options for non-story-critical characters early. Monica's scene is a good example: the 3 killswitch choices were available right away, so if you didn't want to cheat on Emily (or if Monica just seemed bland) you could end it quickly.
All of the above assumes they'll do a good job of maintaining story integrity, which might be hard if we cut a lot of unappealing characters.
Here's some typos I noticed in v1.0.3