I'm not sure that's quite true. Ryanair made quite a big thing about 'growing up' a few years back and specifically targeting business travellers. If their expansion slows and the airline reaches maturity they will need to attract people by differing means other than cheap tickets. It's also a bit contradictory to say they don't care about branding whilst they're trying to launch three new brands. If branding wasn't important then they would just keep the Ryanair logo and name on the side.