Saville is going to get blasted off the court in Melbourne based on his current form. It would have be.en nice to see someone who would compete get a WC.
Your right he will get beaten but I think he has earned a shot if nothing else for experience. Next AO to be considered he needs more form. Very few wildcard options would have a good chance of winning. I think unless someone does something special in Sydney that Duckworth and Patrick-Smith will get the last two. If Groth had done a bit more in New Caladonia then he may have been considered.
As for qualifying Krygios gets one automatically. My guess for others are Reid, Bolt, Barton, Look, Kokinakis and Jones. I'm not sure about the other two. Perhaps Guccione and Ball if they are competing or perhaps one or two for an overseas player. I wouldn't bother with Ball or Guccione but I think Tennis Australia would give them one.