If the department finds that such person is not an habitual offender under this chapter, the proceeding shall be dismissed, but if the department finds that such person is an habitual offender, the department shall revoke the operator's license for a period of seven years: PROVIDED, That the department may stay the date of the revocation if it finds that the traffic offenses upon which it is based were caused by or are the result of alcoholism and/or drug addiction as evaluated by a program approved by the department of social and health services, and that since his or her last offense he or she has undertaken and followed a course of treatment for alcoholism and/or drug treatment in a program approved by the department of social and health services; such stay shall be subject to terms and conditions as are deemed reasonable by the department. Said stay shall continue as long as there is no further conviction for any of the offenses listed in RCW
46.65.020(1). Upon a subsequent conviction for any offense listed in RCW
46.65.020(1) or violation of any of the terms or conditions of the original stay order, the stay shall be removed and the department shall revoke the operator's license for a period of seven years.