I have no opinion on the movement of new housing purchase prices. It depends on the kind of landlords buying houses in Amsterdam, and their alternative investment options; also on the volume of additional demand generated by the increase in rents.
I'm not sure why you believe the Amsterdam rental market to be predatory, or what you even mean by that. Perhaps you have more experience with it.
The national obsession with landlording and trying to get someone else to pay for your mortgage ended a few short years ago with the world's biggest bailout. In Ireland there's very little regulation and what there is is almost completely unenforced. No lessons were learned and we now have a national housing crisis with a neoliberal government turning a blind eye to rampant homelessness and a lost generation. All potential solutions are met with excuses as to why it will only cause problems for the young being able to rent, thus furthering the crisis.
Right, I'm sure impoverished young immigrants buying newly built houses only to rent them out is a very common thing in Amsterdam.