Are my concerns about the Pope valid?

When Pope Benedict of the Catholic church retired a few years back,I had serious concerns that his action would start a precedent where the current Pope would retire if they simply didnt feel like doing the job anymore.At the time,I was told that I was being silly.Now Francis,the current Pope,has been making comments to the effect that he may feel compelled to give up his tiltle in a few years because,as he put it"I may be too old to keep up with the job!"Look,whether you like or dislike Francis-I personally feel that he is a good person but an overly politicized Pope-the Papacy is NOT supposed to "serve their term"like an elected offical;they agreed to serve their post FOR LIFE.If they are unwilling to make that commitment then they shouldn't agree to be the Pope!Am I right in thinking that playing musical chairs with the Papacy will only degrade the position?