The basic fixed fee (large entity) for filing is roughly $1030.00. See IPBiz, Fee Structure at the USPTO and also http://www.uspto.gov/web/offices/ac/qs/ope/fee2007september30.htm.
Go backwards for a minute, one notes that roughly 20 hours are spent (on average) examining one application. This works out to $50/hour. That's around $100,000 per year salary. If the average salary is less (or average fees more), then there would be an increase in examination time per application under the POPA proposal.