If I was flying to Stockholm on business I would be mightily hacked off if the company booked me on Ryanair and a distant airport. They are not really a business friendly airline....
Essentially Infratil can't spend money as they haven't really got enough and they would see little return on inverstment if they did because Ryanair pay them Jack S***. What you've got at the minute is pretty much what you will have in 2020 short of a lottery win or a takeover.