1 bitcoin = 1,000,000 bits
It's a clear and obvious choice, and that's why it's being adopted by some of the larger players.
I've yet to see an argument against it that doesn't inadvertently argue for it.
It is nonsense, but that doesn't mean it won't be used. "bits" doesn't imply 1000000 and if you saw it without a key you couldn't figure it out.
1 BTC = 1,000,000 uBTC
That is clear and obvious to most people in the world. Many will use the metric system but it is so simple to use.