Not all supporters of BU/EC have gone off to mine Bitcoin Cash. BITMAIN's stance on Bitcoin Cash, for example, is unclear, and they are a particularly large supporter of Bitcoin Unlimited. For now, BITMAIN are not directing their pools' hashrate at Bitcoin Cash.
However, I would argue that consensus is now favouring at least the SegWit part of the New York Agreement (and we'll find out about the hard fork later).
The important thing is that you can signal for SegWit and still signal for Bitcoin Unlimited. All of the supporters of Bitcoin Unlimited are now signalling for SegWit because of BIP 91 (and before that, most of them had been signalling SegWit).