Interesting "Seven Days in May" scenario. However, just because disgruntled public statements were made by several distinguished armed forces personalities expressing disapproval of the President's actions and declared intentions, does that necessarily mean that the military is planning a coup to overthrow him? Would the originally Roman Catholic Mike Pence then become President, or someone like retired General Colin Powell, Honorary Knight Commander of the Order of the Bath, with a Scottish Coat of Arms, as an 83 year old figurehead (only meant as a comparison of ages, Marshal Petain was 84 when he became Head of State of Vichy France).All the essential pieces were in place. All they needed Trump to do was declare himself dictator and impose martial law, so the generals could step in and remove him from office.
It may not be so "easy", as President Trump could have chaos ensue if he tries any of those mentioned alternatives in that article, without first allowing voting completely by mail, or postponing the election, before attempting to cancel the election altogether.