I think the many repeated questions raised about 'Last Mile Connectivity' is more of a creation by the very large affluent private vehicle loving public in this city that loathes walking even short distances to & from bus stops, rather than reality.
For example, in places like Mumbai, Mangalore & Chennai, there are people that easily walk upto 1.5km for PTs & sometimes even 2km, wheras in Bangalore, even distances of less than 1.0km is viewed as a serious "last mile" problem since it compares poorly with private vehicles for mobility that everyone has gotten used to.
In Mumbai, ascending & descending stairs at train stations & walking to bus stops can be more strainous than the exertion of walking over a km, but most people do it as a matter of course & without any fuss everyday amidst crowded & very uncomfortable conditions - & these include many well-off office executives, too, who prefer trains to avoid the time delay & strain of driving long distances through crowded roads. For many residents in suburbs such as Chandivli, Powai & Marol, bus access is well over a km but they walk anyway to take a bus to get to the train station, stand & travel within packed trains & walk more at the stations (both ends).
In Mangalore, buses ply only on well patronised main thorougfares. On NH-17, between Kadri & Pumpwell (2km), there are no buses decades on due to lack of sufficient number of patrons. The story is the same at Ullal, Hoige bazaar, Marnamikatte, etc. Thus, people living in or around these areas are forced to walk well over a km to the nearest bus stop.
Even abroad, the walk component on a trip can be considerable, even in cities that have good PT systems. In fact, real estate prices are dependent on how close or far the home is from the nearest train station or bus stop. There are residential buildings in New York that are far removed from the subway in Queens & Brooklyn, but people walk anyways, but pay lower rentals due to the inconvenience of the location. This does not necessarily mean that buses must be run there, despite the poor patronage.
I don't believe that it's possible to run buses in narrow roads within residential or interior areas with insufficient loads to address the so-called 'last mile' problem for all - any form of PT has this deficiency & this must be accepted as a reality with PT.
Given these examples, why do we find it so hard to accept the fact that buses can only be run where roads are wide enough & where there are sufficient number of users ?
This aside, no large city can manage with only buses for PT - Bangalore is perhaps the only large city of 8 million people that is still trying to do it. All large cities have train systems or Metros on exclusive tracks to move people faster. Buses in mixed traffic can never match the efficiencies of such train systems over long distances.