They aren't that likely to lose each customer. Ryanair targets cheap flights, their customers are those who discriminate on price. In this instance there is even an externality to point to, shifting the blame - even implicitly.
It also has to be considered that shrinking their market share is viable if it allows the company to survive.
Depending where the customer lives and wants to go, Ryanair can easily be 2-12 hours faster than the alternatives.
Especially in Eastern Europe, they might be the only airline with direct flights between smaller cities and Western Europe[1]. There's no way I'm choosing Lufthansa and changing flights in Munich if I can go direct with Ryanair and save 3+ hours.
I've wondered if I show up as this type of customer to Ryanair, since there have been a couple of times when it's been within their terms for them to charge me (e.g. slightly overweight luggage, lost boarding pass) and they haven't.
> their customers are those who discriminate on price
Not only price. We've flown previously with Ryanair numerous times, and I don't think price was ever the deciding factor - they simply fly to a lot of European destinations, so for us it's meant shorter routes.
They've completely lost my trust after this debacle though - their illegal behaviour had been utterly shameful, and I'll go out of my way not to use them in future.
It also has to be considered that shrinking their market share is viable if it allows the company to survive.