PM dare not contest a SMC one
lol
in 2016 GE, there will be only 2 SMCs left.
One is at Hougang and one is at Punngol East.
PAP will be scared to lose more seats 
BUT hor, in 2016 GE,
PAP is likely to lose more SMCs if there are still more than 2
SMCs available,
PAP is also likely to lose 3 or more GRCs too as now WP has
sufficient talents
and resources to win 3 to 5 GRCs in the 2016 GE. 
SDP should be able to win 1 GRC if it is willing to work hard
and go to their
targetted GRCs on a weekly basis or even better on a daily basis
to listen to the
residents and help the residents. So far, SDP is seen to be more
interested to sell
their party papers in these areas only.