So you want to penalise those with the ability to get thousands of people to work together under one alliance because you're unable to convince people to form under your banner?

Doesn't seem like that's making a fair playing field, sounds more like pandering to the lowest common denominator.

There's also the fact that, say, goonswarm for example were an "alliance" before they even started the game. Given they all came over from somethingaweful.com

Similar goes for Test

There are a few groups where they're just communities who have come to the game at the same time on mass.

Hell, look at how some of the Russians play. I've seen fleets of Russians where they're all in different alliances and corps, even NPC corps all together in well organised fleets.

So, I'm not entirely sure how you'd manage to stop those well organised people gathering together in larger groups.
Especially with things like jabber etc.

Just because you can't doesn't mean others should be able to.

Eve was like that once before. It didn't cause any heart attacks then.

Step 1: Form blue donut
Step 2: Spend moon money on suicide ganking everything in highsec
Step 3: Start a rental program
Step 4: Some bears move to nullsec and become renter slaves
Step 5: Spend the renter slave money on ganking even more highsec
Step 6: Exponential renter slave money and ganking
Step 7: Noone lives in highsec, all the bears are enslaved.

If 10,000 people want to work together to do a thing putting in place limitations forcing them to be split into 20 groups of 500 isn't going to stop them, it's just going to be annoying and it'll be annoying for no other reason than to be annoying.

CCP should ban people who post on out of game forums.

[Citation needed]

What prevents this now is the architecture that puts a select few in actual power vs one that encourages broad diversity. Simply look at the "blue doughnut " and how many corporations join/leave each/any of the alliances across any given week.