Peak Drilling Rigs?

The latest excuse for not increasing energy supplies is that it will take until 2030 to have an effect. (I suppose if they came up with a closer date, they think we'd ridicule their short-term thinking.) When we try looking for actual reasons, we see this explanation from Joseph Romm (Joseph Romm also measures nuclear costs by total amount spent since the technology was invented and wind costs by cost per day per household):

As she explained, the constraints on offshore drilling have little to do with the price of oil, but a lot to do with timing. Once the leases are available, it is a 5 to 10 years before you get to exploratory drilling. There is a tremendous shortage of drilling rigs and manpower. Plus, offshore drilling is so expensive, you don't want to make any mistakes. So you spend do a lot of seismic analysis to minimize your chances of a dry well.

Is this based on the idea that there's a fixed quantity of drilling rigs and oil workers? Are the drilling rigs mined from rig deposits dating from the Paleozoic? Do the oil workers themselves come from wells?

By the way, isn't the pro-drilling policy backed by supposedly short-term oil companies? Whatever happened to the left-wing cliche that corporations only think about the next quarter?