since Brits arrived to management the company is a disaster
Funniest thing I've ever read!
Iberia has NEVER made an operating profit. They have always been underpinned by the Government either local or from central. Their working practices are antiquated, their fleets are a mix of several different aircraft types and manufacturers making an engineering nightmare and their Unions are set in the stone age.
The old Iberia management don't want to sort things out 'in house'. Confronted with a problem their 'soloution' is to sell, outsource and lease back as they believe that will make all their problems go away.
The grass roots Spanish worker may well be hard working but they don't want to be as productive as they could be.
As painful as it will be Iberia itself, and those remaining (no-one knows the front line/back office split yet) will be a better, hopefully profitable, airline.
Without radical restructuring Iberia would go to the wall in pretty short order. Don't believe me then look at the restructuring that AF is having to undergo at the moment.
Irrespective of who pushes the changes through the changes themselves were inevitable.