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A tooth that needs a root canal presents with two options:
1. A root canal followed by a crown. An important question to be asked before you spend this money, is if there is enough good tooth material remaining that will support a crown. If the final post-root canal restoration cannot guarantee that this tooth will remain in your mouth for a minimum of 5 years, then it is better to have the tooth removed and to spend money to replace the missing tooth, either by implants or a three unit bridge.
2. Get the tooth removed. This is the cheaper option, but unfortunately the resulting missing space will cause the tooth behind it to slowly shift their positions and drift into the space. These unnatural teeth positions can cause problems of food lodgment leading to periodontal disease, and TMJ problems due to abnormal teeth interlocking. To avoid these problems, the cost to replace the missing tooth, if you choose to do so will be in the thousands of dollars, whether it be by placing an implant or a three unit bridge. The cheaper option to replace the missing tooth is a flipper, which can damage the adjacent teeth in the long run.
I would personally suggest that you retain the tooth and get the root canal followed by a crown.
But if you are going to get it pulled, I have now made you aware of the effects of that choice, so your decision will now be a more informed decision.
Hope this answers your question. Please leave a positive rating for me if this answer has helped you. I do not get credit for it otherwise.