Tropical Zone Gardening: pull the plug?, 1 by happyisland

happyisland wrote:
Last year we moved into a house with a bunch of lovely old trees. Since then I've already had to remove one huge 60-year old royal poinciana tree and now I'm afraid the mandarin orange in the front yard is on its last legs.

I pruned off all of the substantial amounts of dead growth and now there's almost nothing left. It has fruited, but the fruit has remained very small and some of it has started to turn orange without growing to appropriate size.

I've attached a picture of the tree. What do you people think? Is it time to move on?