Do you know how long it takes for gold to tin connections (not soldered, but cable to component) to de-grade?
Unfortunately there is no clear cut answer to this question as there are a few variable's, the most important being Temperature/Humidity. An outdoor connection will oxidize much quicker that a relatively Temp/Humidity controlled room in your home. The good news is in an indoor environment it will take years to have any signs of a problem. Cleaning connections occasionally with Isopropyl Alcohol is a good thing to do. Even if you have any contamination it usually will be on the Outside Diameter of an RCA type plug and can be cleaned with a very fine scotchbrite pad and you will be all set. If I haven't put you to sleep yet I end the conversation by saying "Don't be overly concerned, you will probably never have a problem." getting off track a bit do you have a 3805 receiver now? I was recently contemplating the 2805 or 3805 and was leaning towards the 2805. Any opinion to offer?
