I share your doubts about chemo 100%, but we're each unique, and it's a variable situation. When my turn comes, I shall see the oncologist and try to get straight answers. Personally, I wouldn't accept the treatment on a "2 year Deal", but neither would I seek quack therapies.
Once there's no real prospect of treating the disease, I'll concentrate on living to the full while I can. And I'd stop having PSA tests straight away. There's always hospice care at the end - and it's excellent for the majority. And If my symptoms refuse to be managed, then there's the Swiss Solution or a DIY equivalent.
Once the day comes that I have to accept it's 'downhill all the way', the up side is I'll be free of worrying about it; there'll be no point.