Sinbad,
Check my post again, choice is made via a combination of factors. I said pax are aware of the equipment being flown, not that they request a specific type mate. Their decisions are made using various criteria especially for the more discerning premium pax.
I know for a fact people will recognise an old aircraft(in/exterior) off the bat. With all the media attention centred on air travel these days, it has helped the general public make more informed decisions with regard to both choice of carrier and travel arrangements - and that goes from a-z, from meals to schedules.
If you want passengers, offer them value and service, we can't rely on the old "if you wanna get there you have to go with us" mentality.