Listen to Airbus ( video) in the next 20 years the overall trend is larger more fuel efficient aircraft.
Global Market Forecast 2012-2031 | Airbus, a leading aircraft manufacturer
Sitting on your hands never proved the right strategy.
Contractual issues around switching types are on a totally different level.
Airbus looked at stretches for the last 15 yrs. Its a question of demand, resources, competition and overall strategy to determine the right tactics and timing.