I wouldn't mind 8-12 solely because I know I wouldn't collect all of them. I just can't dive into every line, nor do I want to. Something like:
January - Severus Snape
February - Reeve Superman
March - Frodo&Sam
April - Batfleck Batman
May - Rick Grimes
June - Draco Malfoy
July - BvS Wonder Woman
August - Thorin Oakenshield
September - Daenerys Targaryen
October - Negan
November - Boromir
December - Michael Jackson 2.0
Spread out among the different lines they're working on right now, don't overload one line in particular, and have a slightly longer pre-order window so people have time to figure out what they want to do.
I wouldn't mind a schedule like that, because of those 12 hypothetical announcements, I would be down for 5, maybe 6, so I'd be able to manage. I'm sure many folks would be in the same boat and not need all 12, making it more bearable.