I'm not familiar with RAM... interesting to see that they are a 4-star airline with Skytrax, but get a 3/10 from Skytrax users.
With AS strengthening their ties to EK, I don't think they're thinking about OW in the near future, which may boost WS's chances if they were to go for it.
Now that OW's proclivity for letting only carriers with a proper F class has waned (look at the downsizing of F cabins on all the first-tier members), this should open up more carriers looking to forge ahead with membership. Or perhaps OW should start actively poaching ST and *A members.