Only you can decide whether it's time to put your current system out to pasture.
Salvage...It sounds like you need a new console, and an anemometer (or bearing assembly). Has the solar panel hazed over enough to be lagging in keeping the super-cap charged...need a new one? And, the super-cap...any leakage showing around the leads? You might as well replace the temperature/humidity sensor with the updated (but questionable) SHT-31. The Davis tipper rain gauge is deficient, so maybe splurge and update it with a new Rainwise 111 gauge...??? And, if you stay with the Davis tipper, the new bucket is fantastic in keeping debris out and stopping birds from using it as their private loo. Any of the structural plastic getting brittle?
Replacement...Plop your money down and get the smell of fresh plastic gently floating around your house.
Most every part will be updated to the current parts and you would not have to do the individual parts replacement and encounter possibly problems along the way (you never know).
You might could save a couple of hundred USD by refurbing, I dunno. Again, you'll have to make that decision. I just thought I'd throw all that at you.
But, as for the console...yep, I believe it's still as beautiful as it's been for years...