Not everyone in the government of Singapore is bad, but it will take a little more time before some of those that need to move on will move on. It is not appropriate or good for some of these people move on now, due to the possible disruption it will cause. But move on, they will, no matter the height of the ivory tower nor the comfortable positions some have grown too accustomed to at the expense of others.
Let us not forget that Singapore underwent major changes in language medium, cultural and economic focus. While the younger generation have adapted to some of the current changes better, some of those teaching changes of past were ill equipped to do so. In between some important lessons also may have been neglected along the way and amendments need to be made.Factors external to Singapore have not made things easier either.
The frustration felt by Singaporeans who can and should be contributing more is empathized and acknowledged. One should could contribute more when one is at one's prime, rather than later. But all these takes time, unfortunately, for Singapore is young. There are some fruits that the pioneering leaders of Singapore cannot hope to enjoy, in spite of their contribution. Fairness is sometimes a difficult thing to dole out equitably to those who contributed most or can contribute most, though the ideal is noble and deserving to pursue.
This is an explanation and not an excuse. It may fall on the shoulders of the post 80s or even the post 90s and later to take Singapore into the next level.