TfL's consultation report has just been published: https://consultations.tfl.gov.uk/tube/bakerloo-extension/user_uploads/bakerloo-line-extension-consultation-report-final.pdf
Tfl say: more than 15,000 responses were received from members of the public and stakeholders offering their views on the extension’s proposals. Overall, there was a very high level of support for the principle of an extension to the Bakerloo line. More than ninety five percent or responses expressed support for the principle of extending the Bakerloo line. Read more: https://consultations.tfl.gov.uk/tube/bakerloo-extension/consult_view