I didn't even look at @bronko's collection and I came to about the same conclusion, simply based on "cui bono" Who benefits from this proposal? Whales. Nouveau riche whales, to be exact. I would guess his collection is

• at least 400K in CP (probably more- maybe 2-3x as much)
• none of which is rented out
• very few, if any, of his cards are 'for sale'
• very little, if any, is 'on land'
• none in 'Mage Wagons'
• none delegated to alt accounts
• some SB Reward cards but probably < 100K in CP
• very little in Gladiator cards (if any)

Nouveau riche? Mostly, if not all, CL cards.
Not many Glad/SB Reward cards? If he had them, he'd be playing in Modern.
As it is, he crafted a very pro-bot proposal that purports to minimize bots while very carefully targeting new players.
"If you don't own at least 400K CP in cards that you don't rent out/put on land/delegate to other accounts- you need to be punished."

In other words: "You kids need to get off my lawn!"