Should I wait for surgery or get a second opinion?

They found sever stenosis in lower lumbar spine and had me see an orthopedist. He said since I don't have immediate symptoms that he'd wait on surgery. He said (the usual) "I treat the patient not the mri."

My questions is: since it's an emergency surgery once symptoms do appear and the fact that decompression surgery is well tolerated and gets good results, is it better to have the surgery pre-emptively or wait?

Should I get a second opinion?

Thanks,