As Dr Thum said, there is an entire network of Lee related people within the political system and the offices of power in Singapore. Even if you bring one man down eg LHL, eg PAP lose power there will be his supporters with power in the courts, in the civil service. Unless all those Lee related families become disloyal and turn against the Lee family then you can have change. Even if change comes about it will take a long time.
I do agree about the crackdowns and chaos that might ensue. I disagree that Singapore will have a good outcome afterwards.
It is either more of the same and a slow painful death of Singapore or a sudden disintegration and utter collapse.
You are right. There is too much self-serving corruption. Wise leaders round the world can see.