Market effects are king. Regardless of whether you are a big-block-head or a small-block-head, I don't know whether we really understand this, but if people were given a vote over big-blocks and tiny-blocks in Bitcoin I don't think we would see 10% of the btc-weighted vote going to the big-blockers as the price suggests. The one megabyte-block side retained all of the network effects: the original logo, the symbol, the exchanges that use it as a unit-of-account, the public recognition, and status as the gateway from fiat; and BCH had to start over from zero.
Now say Steem splits into Steem-Sun and Steem-Classic. The Steem-Sun chain would keep the Steemit website and the Steem symbol name. I think one would be crazy not to dump the the Steem-Classic fork coins after seeing what happened with the BTC/BCH split.