My specialist wants me to change from oxycontin to methadone. Smart move?

Buprenorphine helps. You might also consider Buprenorphine and attending a meeting of narcotics anonymous.
OxyContin to methado. Absolutely yes. Long term use of Oxycontin is not good. Your specialist is right Methadone is a better choice long term.
Trust your doctor. Both are long acting pain medications and are appropriate for the treatment of chronic pain.