As far as I can see, Singaporeans missed the boat in not grasping the opportunity to throw out the PAP in 2011.
By the time 2016 comes along, the number of new citizens will have reached the level where they will be able to influence the outcome of the elections in favour of the PAP.
The only hope will be if 100% of native Singaporeans vote against the PAP... something which is extremely unlikely given the sinkie psyche of fearing the unknown.
By 2021, new citizens will be the majority and native sinkies will be close to extinction.