Locals expecting a glut of 10,000 scooters to descend on city streets under the San Francisco Municipal Transit Authority’s new scooter program will find fewer than half are actually hitting the streets. The SFMTA lowered the cap to 4,000 scooters and, per comments and a resolution approved last week by the Board of Supervisors, a phased-in rollout of scooter fleets. Under the new Powered Scooter Share Permit Program, which kicks off Tuesday, Jump, Lime and Spin scooter fleets are hitting the…