Do they really need to ground the entire fleet for that? One incident for ten thousand planes in the air for years. I'd think that giving airlines two months to fix it would be sufficient.

I wonder who eats the cost of this? I presume it's the airlines.

So the immediate cost to Airbus of grounding the fleet is quite low, whilst the downside of not grounding the fleet (risk of incident, lawsuits, reputation, etc.) could be substantial.

I don’t believe it’s been years, only the latest firmware version for the ELAC is affected. The fix is to downgrade (or replace hardware with a unit running earlier firmware)

I imagine it could help with Airbus marketing.

"We take proactive measures, whereas our competitor only takes action after multiple fatal crashes!"

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