It was previously mentioned that the M50 and M66 serve a smaller population, and I made my suggestion with respect to that knowledge.
The latter is an underperformer, having made statistical headlines as the pokiest route in all the system, and the other caters to a specific population set better suited to utilizing AAR. ♿🍎
Just to clarify, the pairs I suggested were the M42 combining with the M50, and a separate combination of the M66 and M72, the bold being the dominant remnant of the merger.
The discarded routes would be limited stops and the superimposing routes would remain unchanged. Some crosstowns already coexist on the same and differing streets (M96/M106), so I don't see my suggestion as unusual.
The MTA is bleeding money by the billions. It's either drop underperforming buses or force riders to pay more for lackluster service. 🤗