In principle, I'm against the NMP system, but if it's to be there, then I'd think all should be one-termers, no repeat terms, whether viewed to be pro- or anti- government policies. NMPs are supposed to be social representation in Parliament, not political representation. Keeping multi-term NMPs defeats the purpose as certain agenda can get entrenched and other issues not being voiced.
It was supposed to be two terms but somehow Simon Tay (Zulkifli and Eunice as well?) got 3. Some got one. So some forummers here are right, the process is too arbitrary. Then again, nothing should be unexpected of a PAP dominated Parliament. Should there be a multiparty Parliament and the NMP remains, I expect appointments of NMPs to be more transparent and consistent and less shrouded in mystery. Siew would have got another term. However, it is more likely that the parties will collectively send the NMP scheme packing.