Yes, but you have to remember that prior to the mid 1960s, Bedford Avenue never had bus service. It was only when Nostrand and Rogers became one way pairs, that the TA was forced to add service to Bedford and NY Avenues. It was not done to help bus passengers, but to speed traffic which it greatly did on Nostrand and Rogers. But Bedford has always been exceedingly slow for buses. I don’t see moving service from Bedford to Ocean as a loss, but as a gain.
The only riders that would lose a Brighton connection are those from east of Utica Avenue and I doubt there are many. If the B16 terminates at Rutland / Sutter, those near East 98 St would use that route to access the Brighton line and some could walk from East NY Ave to Clarkson for the B16. There would be very few east of Howard Ave who are going to the Brighton line. Most B12 riders are destined for Kings County Downstate or the Nostrand Ave Line. I used the B12 all the time growing up so I am familiar with its usage.