we have 2 distinct property markets. dublin, and the rest of the country. dublin will drop a bit but demand will stop it going too far.
There are multiple markets within Dublin as well, and issues like this won't affect them all equally.
Certain sectors of the economy will be better isolated from impact than others, for example HSE staff in most functions aren't likely to be laid off or put on reduced hours any time soon, similarly, most of the large IT companies will continue to operate with staff working remotely for some time to come. On the flip side you have many in the retails and hospitality sectors already out of work. So the market for what were ~€400k homes in Dublin last month may be impacted more than what were €800k homes.
Supply will be another factor. We know that before this broke there was more demand than supply, and new house completions were expected to fall well short of demand. Will building slow down? Immigration & emigration numbers will be affected.
Trying to predict how this will all play out really is crystal ball stuff though.