I can't open the link but I'm assuming there's nothing beyond the above description contained in the article....and if so, in a nutshell that's basically why globalisation is a scam designed to benefit the few via the creation of a new form of feudalism which looks like it will be based on ownership of urban property rather than rural farmholdings.
While this couple are out in The Gulf, the property that they should ordinarily be renting in Dublin will instead be occupied by a group of foreign students working in a service industry whose main custom is provided by members of the same landed gentry class that owns the rental property.
Globalisation and the mass movement of cheap labour into developed urban areas the world over is ensuring that previous limiting aspects of market theory such as availability of labour no longer apply. Effectively, the notion that there was an 'ecological' element to such theory in so far as markets were believed to expand and contract as if they were living entities is no longer arguable. There is a mass of people out there who, despite the fact that they are currently physically located in Bangladesh or Nepal, are potential actors when it comes to the Dublin housing market....and of course to question whether any of this is wise in terms of its future impact in societal terms, is to risk being labelled racist etc.
Almost 40 years ago now Thatcher espoused the idea that there was no such thing as 'society', just many individual economic actors. It's ironic that it looks like it will be liberal/leftist concepts of diversity and multiculturalism that will ultimately be the banners under which her vision is finally realised.