I think there are a lot of factors at play here that make it difficult (for me at least) to say this is a straight equation. Of course the number of participants is important. But what is the threshold and time window for activation? Are the miners actually ready to produce DC-compatible blocks (signaling is not strictly readiness), and also what is their tolerance for risk of producing a block that might get beat out by a non-DC signaling block (the URSF can even block DC-signaling blocks before DC activation)? Miners have budgets and profit margins. Are they ready to assume this risk over a protracted, contentious battle? Can pools that signal for DC keep their participants from jumping to another pool that doesn't?