Thanks to everyone for the feedback and comments.
I'm still in favor of the split (either 2 or 3 - in 3 you'd have to get a 3rd allocator) since you have 2 capital allocators (Ted and Todd), which would allow for at least 2 smaller Berkshires. I do believe it would create additional value. Arguments against have included: no incremental value created (I believe in smaller size even at 1/2 helps), not a permanent home for cos selling (they would still be a part of Berkshire Hathaway 1 or 2 or 3 (though 3 i would envision be cash only), not be able to reallocate capital (they would as cash is generated a capital allocator can re-allocate, except they have less businesses to choose from, but on the other hand plenty of businesses just as Buffett did 20 years ago).
Help us understand your logic for splitting it up. What specifically would BRK gain access to that it doesn't already have? The operating subs can take advantage of smaller acquisitions as bolt-ons. Berkshire wouldn't magically gain access to a new subset of opportunities because it was half the size. The subs are operated in a decentralized manner already. It's almost as if they're still investments vs. wholly-owned subsidiaries. In other words, Berkshire takes a portfolio approach.
Berkshire is really a collection of businesses, not one large business. Say you take GEICO, BHE, and BNSF and put them into a BRK#2. Now the other businesses are "smaller" - what have you gained?