However, a Facebook page dedicated to rallying support for keeping the camping ground had so far nearly 11,000 likes, page co-organiser Jan Gopperth said.
She knew of about 200 people who said they would make submissions to a hearing of the resource consents bid, probably held in June or July.
A last-minute flurry of submissions was expected before today's 5pm deadline for public submissions.
"I have seen excellent, well thought-out views of people from all walks of life, including sailors, long-time residents and campers," said Ms Gopperth.
"I think the tide is turning in favour of keeping the iconic camping ground."
Auckland Council said it would release the number of submissions later this week.
The promoters and finance raisers for the training facility, the Harbour Access Trust, scaled back earlier plans.
It now proposes a single-storey building set into the corner of Alison and Earnoch Avenues, covering 8.4 per cent of the reserve and allowing for a roof garden for a public viewing area.
Meanwhile, the Takapuna Beach Holiday Park's summer season went "extremely well", said park proprietor Marius Rothmann, considering its Auckland Council landlord allows it only a month-to-month rental.
In December, the park had 3372 guests and it had 3898 in January, 3200 in February and 3298 in March.
"Half of guests were from New Zealand and half from overseas - and they spent a lot of money in the local area."
• View the resource consent application here