The number of general district court judges and juvenile and domestic relations district court judges, excluding substitute judges, shall be determined as follows:
a. Judges in office on January 1, 1973, shall be permitted to complete their terms pursuant to § 16.1-69.9;
c. On and after January 1, 1974, the number of judges authorized in each district shall be determined by the General Assembly based on the requirement that all judges whose terms commence on and after July 1, 1980, serve on a full-time basis; and
d. On and after July 1, 1980, the number of judges authorized in each district by the General Assembly shall be based on the requirement that no district judge whose term commences on or after July 1, 1980, shall be elected to serve in more than one district or to serve both a general district court and juvenile and domestic relations district court in any district; provided, however, that a judge may serve more than one general district court or more than one juvenile and domestic relations district court in one district. The Committee on District Courts shall make a study and report to the General Assembly on or before December 1 of each year on the number of judges needed and the districts for which they should be authorized. If the Committee recommends the creation of an additional judgeship in any district, it shall publish notice of such recommendation in a publication of general circulation among attorneys licensed to practice in the Commonwealth.