The air is rife with rumours that SQ are revamping their mileage charts soon (March 1st is mentioned a lot..). The good news is that its likely Savers will be available again across the fleet, the bad news is that this "enhancement" will likely be at significantly higher mileage levels (or the cynic in me... Standard will be the newe Saver..)
If you go to the Mileage Calculator on the SQ website you'll see;
If you are travelling before 1 March 2012
Award Charts
Upgrade Charts
If you are travelling on or after 1 March 2012
Award Charts
Upgrade Charts
But like much of the rest of the SQ website, the link to the Awards Charts for travelling after March 1st is not yet working. I agree with you that any 'enhancement' however, is likely to cost us more miles somehow.