@Lethologica
(1) Making other people's solos less bitter has nothing inherently wrong with it.
(2) However, making soloing easier is definetly a problem with SWS. I wish there was a good way to amend SWS to lessen that effect, but I at least don't have enough time to develop a new diplomacy scoring system. This is certainly the main downfall of SWS.
(3) There's our big problem. Neither SoS, nor unranked can be replacements for SWS.
First of all, DSS is closer to SWS than SoS. DSS and SWS share a common point distribution during a draw, whereas SoS does not. Also, neither SoS, nor DSS share SWS's point's distribution in a solo, which is what we're defending it for.
Unranked can never replace a point distribution type. They are fundamentally different systems, with fundamentally different goals. Points, while not necessarily a complete representation of skill, are a status symbol on this site. It is arrogant to assume that players who play SWS don't also want to improve their rankings, just because you consider their preferred method of play to be inferior. People who enjoyed SWS as a point system should not be expected to go play unranked as a replacement.
(4) You forgot one, Lethologica. Variants, Live games and, to a lesser extent, GBs. SWS, in my opinion, is the best scoring method for these more casual game types. In my experience, these types of games are much more unbalanced than vanilla dip games. Live games have a lot of problems with NMRs, variants can have quite unbalanced maps, and GBs don't have such an intensive diplomacy aspect to balance out the game more. For Classic, Vanilla diplomacy, I agree that DSS is the best system, but not for the other ways to play.