San Francisco voters may grab Uber’s piggy bank, crack it open, and fund Muni if they approve Proposition L next Tuesday. Muni’s financial situation is dire: The San Francisco Municipal Transportation Agency’s $227 million budget deficit threatens future Muni service, the measure’s proponents worry. Riders and drivers are already getting hit. In May, the SFMTA announced it would reduce discounts for Muni riders and increase parking fines to lessen the deficit.