I think font size is more important than its colour. It's alright for many of us with normal vision, but for the visually impaired colour interferes with contrast. So it's more important to have the gate and boarding time in large print rather than colour it red.
The service information field is quite poor. Whilst a passenger will rarely find this information useful to them, it needs to be clear enough for those who need that information to read it quickly. As a corollary, it should not be printed on a shaded field.
And what's the point of having the origin and destination in IATA in big print on the main part of the BP and then have the same information spelt out in small print on the counterfoil? Seems counterintuitive (I know this doesn't bother many of us since we know the IATA codes off by heart...)
Let's face it: the idea in the article is a reorganisation, not a redesign (well, at least for QF BP anyway; there are some horrid BPs out there on even major airlines). The idea is sound in principle but the exemplary specimen is so flawed it almost invalidates the argument.
There was someone else who flew one of the USA airlines domestic and had a go at their BPs. Fair enough, but one of his ideas of a good BP involved overloading with graphics (especially bleed graphics), which was again a dumb idea.