It is unhelpful to suggest that a fall in stop and search has been directly responsible for a rise in street crime. Pre-Macpherson, the majority of stop and searches did not lead to an arrest, and many that did were for minor offences. Post-Macpherson, the use of stop and search is being used in a much more sensitive and focused way.
Police are much more concerned with the quality of stop and search, rather than the quantity.
Carrying out 100 random stops and searches is pointless. Carrying out 10 that are carefully targeted and result in high-quality arrests is much more meaningful. The use of this power in this way will also find support from the community, as will the abandonment of the disproportionate stopping and searching of black and Asian people. It is criminal intent and not the colour of your skin that should interest the patrolling police officer. On crime, the biggest concern for Londoners as identified in the Met's public attitude survey is burglary.