Can't really comment on your first question, you'd have to hope the eurozone economy might have recovered in 4 years but no-one can really say for certain.
The capital protection part of a tracker is usually provided by bonds issued by a bank or government (in this case PTSB) so if you're concerned about not getting your money back then its this counterparty risk you should focus on.
SocGen provide the returns on the EuroStoxx index so your risk here is that you might not benefit from the growth if they can't make good on this to but your initial capital should be safe.
Presuming whatever instrument PTSB are providing is covered by the gov guarantee than your initial capital is as safe (or unsafe) as investing in an Irish gov bond.