OP,
In order to place a bridge, the two adjacent teeth will be drilled down to almost nothing and crowned which makes them far more succeptible to nerve damage. The best discussion on this topic is in the book "Tooth Truth" by Frank Jerome which is in most public libraries.In any case ,it seems to me that if a tooth is infected it will hurt . If your root -canaled tooth does'nt hurt ,perhaps you should leave it alone for now especially if x-rays show no signs of infection.If you do eventually decide to have it pulled , you don't necessarily need to get a bridge . You can get a false tooth that is attached to the adjacent teeth without crowning those teeth.Keep in mind that dentists ,even biological ones ,always reccomend the most radical procedure possible. What's a biological dentist anyway? As opposed to what-a mechanical dentist?
Many people that I know that have had bridges say that they don't fit well.