Well I have a couple of J tickets from MXP to EZE booked for October and I am not worried at all.
Just realised the dates of your flights so no problems for you on the outbound or the return.
The worst scenario is that it goes into liquidation and hopefully the same as what happened with Swissair and another airline honours the tickets.
To be on the safe side I have booked a couple of redemption tickets with BA if the worst should happen.