It would take a massive home-stretch choke job for the Wildcats to not make the top 4.
As for who misses out, looking at the Kings schedule there's a long road swing coming up with the SEM-Perth-SEM trio in particular going to be tough:
Cairns (away)
NZB (away)
SEM (away)
Perth (away)
SEM (away)
Adelaide (away)
Adelaide (home)
Hawks (home)
Hawks (away)
Cairns (away)
The Hawks games at the end of the year will also most likely be massive for both teams, and could end up deciding who makes it to the top 4. If the Kings win all the games they should and half the ones they might that would be a 7-3 run to finish the season and a 18-10 record. At worst maybe 5-5, which would see them at 16-12.
I wish it were easy to view the other team's schedules, but alas, not so.