k8, if your symptoms are tolerable, watch and wait is probably the best strategy.
In Denmark, 95% of patients with a tumor less than 20 mm are put on watch and wait. ( http://acusticusneurinom.dk/wp-content/uploads/2015/10/natural-history-of-vs.pdf
No matter what you do, your hearing is likely to decline. If you want to minimize the decline, watch and wait has the best results. ( https://pdfs.semanticscholar.org/2cef/abe8e8eef1ae32cab8bcf3c71dd75f53387c.pdf
) In particular, "In the literature, to our knowledge, there have been no reports of the hearing preservation after 10 years or more after hearing preservation surgery or radiotherapy. In the present study [no active treatment], 95 patients had been observed for 10 years or more. According to the AAO classification, 46% maintained good hearing after 10 years or more compared with 45% using the WRS classification and 75% of patients with 100% speech discrimination at diagnosis."
If treatment is required, Gamma Knife has better outcomes than surgery. A simple examination of published papers will confirm this.
The statement, "The long time watch and wait group are a brave resilient group I admit but, most will end up doing treatment as their AN has gotten bigger or symptoms become too much" is unsubstantiated. In https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1502035/
only 7.3% of the watch and wait proceeded to intervention (it would have been 6.8% except "1 patient elected to proceed to surgery although there was no tumor growth or new symptoms"). This success rate is consistent with other papers.
In summary, if your tumor is tumor is less than 20 mm, watch and wait appears to be the best strategy; you will retain hearing for longer and you've only got about a 10% change of requiring intervention.