Speakers' Corner, for one.
Many other PAP policy initiatives were borrowed from SDP's suggestions and shadow policies without giving due credit. Just check out some of the recent changes in healthcare, housing, education and even 'minimum wage'.
Ultimately, SDP can only make a substantial difference if YOU vote it into parliament. In the meantime it will continue to speak up, offer alternative ideas, and just bear and grin it when those ideas are plagiarised by the ruling party and sometimes implemented without due acknowledgement
BTW, how has WP made any changes to your life or existence despite having 6 members in parliament?
I beg to differ mostly but not totally. The recent changes came about because WP won 6 seats. You can say SDP had the biggest improvement in margin, but that was because they followed WP's and NSP's way in avoiding civil disobedience 3 years before the GE.
You also haven't been specific in what areas PAP copied SDP in healthcare, housing and education. The SDP I have watched for many years is known for being duly fond of claiming credit and every time I hear it, I go fact check and most of the time is not true. There was even once when SDP claimed a PAP idea was from them which WP had spoken about years earlier, but I cannot remember what policy it was.
I do give credit to SDP on being first or led to Speakers' Corner and minimum wage. I am not for those ideas or think they benefit me, but at least I can admit they are original. I think I have been fair to as much as I can.
If you are saying being copied is doing something, then there were also stuff PAP copied from WP, hence WP has done something by your logic. One example was Medishield, which was a variation of WP's health insurance idea. But WP topped it to win more seats in parliament and winning over 40% in all constituencies, and PAP is feeling the pressure.
My point in my post is that SDP and Chee should not return to their old ways to disqualify themselves from elections, then talking about them winning seats in parliament won't even be relevant anymore. Moreover, to end up in that state because of something that doesn't affect my life.