Mini bus succeeded not just because of size but because of free market. It was in the interest of the bus driver and conductor to be as efficient as possible to maximise profit.

Alot of ppl also say this model is the best. But I bet once they realise this model also leads to overloading and speeding bus drivers they will then say Rapid KL number one and ban mini bus

Yup, by bringing private buses, I am sure can be done.

Post here can see who really ride the mini bus back then and who didn't.
Half an hour become two hour trip. 

If they were so great they would still be around.

In KL not all busses waited for passengers. The mini busses that plied the PJ KL routes would keep on moving. That route always will have ppl. So for them its speeding and overloading

Its at the old Bangkok Bank and Kota Raya stops where you had the Sri Jaya busses heading into places like Cheras and Hulu Langat that waited abit. Usually from ppl alighting off the mini busses. Anywhere from 15 minutes to 45 minutes.

But yeah got good got bad with free market. Have to find a balance. Rapid is bleeding and dont have the capacity to server the smaller roads. Free enterprises...well you just mentioned their dark side

Two important factors making busses viable as last mile transport.

1) Less than 10mins walk for any passengers to a bus station.
2) Intervals of less than 10mins

So the issue is not only about number of busses. Does our city planners have proper connectivity plans and infrastructure to make it a viable mode for people?

Who would even consider public transport of a 15mins journey becomes 1 hour?