We're going "wide" on Basis. We're writing RDO encoders for every major desktop/mobile format. Once we get all the formats we'll optimize the encoders more. As we do this we discover new things that are possible. We gave the ETC1S<->BC1 bridge to Khronos for strategic reasons.
We're focusing on the high quality parts of the RD curve for BC7 RDO because that's what our customers/potential customers have said they want the most. (And if we don't they won't license it..)