Dalton said clubs around the country were struggling due to changing dynamics, such as numbers, costs and compliance, and Clubs New Zealand had warned against waiting too long to amalgamate.
Its chief executive Larry Graham was in Whanganui for the organisation's conference in March and said mergers had been successful around the country.
"Once they've got that mandate, we can help them think about what might best suit Whanganui's needs," he said.
Dalton said the proposed RSA and Cosmopolitan Club merger was about being proactive.
"We're trying to get ahead of the game so we've been working on this from the beginning of this year," he said.
But ultimately it was up to the roughly 2000 members across both clubs. About 200 are members of both.
"It's all down to the members on Sunday of both clubs," he said.
"They've got to make a long-term decision going forward regarding the future of the clubs.
"It just depends on what form that is. It's a sensible financial decision for both clubs."
Dalton said similar mergers had worked in other parts of the country in places such as Kapiti.
Dalton said there would be some sentimentality but "the club is actually the sum of the people, it's not the building."