So they revert to the well tried experiment of One Unit. A military government is One Unit by another name. And which is why they had made the threat. That is why they talked of the federation of Pakistan being made vital and vigorous. This can only be so if federation is genuine and provincial autonomy is adequate and effective.
Military interventions means extinction of all provincial autonomy.
A military government is a centralised system of decision making that kills all local initiative and decision-making. Which is why it can be said the federal structure of Pakistan is in grave danger. Well, a military takeover did happen and nothing much happened. The fact of the matter is that two military interventions have taken place since 1973. The nominal federation of Pakistan continues to survive whether or not it is vital and vigorous.