cost of auditors increase.
big 4 still need to maintain cost competitiveness with their clients (i.e., MNCs and companies engaging big 4 for audit). It is unlikely that big 4 would be able to nego for a substantially higher price.
big 4 in turn have to aggressively take on many more deals to maintain profitability.
auditors pressured to decrease their turnaround time for each project, i.e., if you were paid 5k and churning ~3 engagements a year, you now get paid 6k but pressured to church 4-5 engagements a year.