I think Saudi Arabia will qualify for World Cup using any possible way.
They spent a lot of money to buy Ronaldo and other European players, they also become the sponsor for Club World Cup, after everything they done for football, would they accept if they're not qualified for World Cup.
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Saudi Arabia knows how to play politics with FIFA. Just look at how they were able to lobby the AFC to have the Round 4 match held in their country, which gives them a significant advantage. Although the decision was protested by other teams because the match was supposed to be held at a neutral venue, the AFC still selected Saudi Arabia and Qatar to host the fourth round and ignored the protests from other teams. Because of this, I am even more confident that Saudi Arabia will qualify for the World Cup.