100% absolutely NO.
Many reasons.
If it’s government funded it will be shut down totally to save money. Charity funded would be a nightmare. Use an example of NPAS, some areas have great coverage and some just don’t. The current setup means local people make local decisions on the best way to deploy, kit and spend. A bit like the police used to do it. A superorganisation could go the way of other large charities. Read the papers on how things change when organisations ‘go large’.
The way forward is better collaboration between areas, linking purchases for lower costs and considering pooling some resources to streamline operations. Combine training courses and mutual aid when required. In fact the AAA is sowing the seeds for just that.