Saudi's have little or no understanding of the merit/productivity system. Once it is introduced, it will cause a tectonic shift for workers, who mostly produce little. Most of Saudi's productive output is produced by highly productive foreigners, not Saudis. If the House of Saud is to get this budget problem under control they will first need to remedy this problem, by forcing the existing Saudi workers to become more productive.
After that the House will need to begin requiring more Saudis to work in these productive jobs. This will happen when the House builds a new non-oil economy.
This is all so much fantasy. the Saudis are dilettantes about their work, few are interested in engaging productively in work, and there is no work culture to speak of among the Saudis. Instead they wish to come to work late, leave early, and be paid well for their kingdom mandated jobs. The businesses look at this as a tax they must incur to do business. However, as the kingdom needs to cut its costs, or increase it non-oil revenues, these rules only reduce the companies profitability, and reduce non-oil earnings.
Reality, and fantasy are on a collision course her in the the House of Saud's Unicorn Kingdom. This should be spectacular.