KLM is obviously not introducing a 4 tier FF program just to add a category below Silver Wing. IMO it will be Platinum > RW > Gold > SW > Silver, with both current SW and RW's eventually benefiting or suffering from the change depending on by what margin they used to qualify under the current program.
The RW's who comfortably exceeded the 24000 point threshold will be Platinums, the rest Golds. Similar situation for SW's. If KLM indeed gives Platinum to all RW's and Gold to all SW's for the first year, this will be more of a transition period/ pacifier for FD elites than a one-to-one equivalency.
RW was easier to achieve than most other FFP's top level, and SW provided better benefits than most other 'Silver' elite levels. I certainly appreciated that benefit, and steered business KLM's way because of it. I do not expect to make Platinum with my current travel pattern, but will be reasonably happy if the benefits offered to Golds are not too diluted from the current RW level.