Regarding this tpl/GY issue, this thought just occured to
me:
They could disqualify tpl on her cooling off day matter and then
put GY in Marine Parade GRC to contest in a by election.
This way, the PM can kill 2 birds with one stone.
Get GY elected back as a MP, and pacify those who are not too
happy with tpl.
The way I see it, even pro incumbent supporters are not too keen
about tpl being MP. 
But this proves that Singapore is not a society based on
meritocracy like what the PAP claims, it's based on secret
connections and a seat in parliament can be gained through the
backdoors. 
You don't even need any political experience, just have the
right connections, stand in Tanjong Pagar or Ang Mo Kio, it's a
guaranteed entrance to parliament. 