A new proposal makes its way into the RFC: It aims to deprecate the cycleway=opposite tagging family that is associated with (logical) problems and is considered outdated by most mappers, since meanwhile there is the much more widespread oneway:bicycle tagging allowing to map the same meaning in a better way.
See the proposal page for more details and rationale: Proposal:Deprecate cycleway=opposite family - OpenStreetMap Wiki
Please discuss this proposal on its Wiki Talk page.