It isn't the case that nothing happened. That one journalist who was most closely involved in it all got blown up in a car bomb, and all the other interests clamped down and made it harder and mor lethal for other journalists to follow suit. Yay for Israeli and Argentinian zero day exploits, anyone can buy acccess to your phone!!
They're thinking of Daphne Caruana Galizia, a Maltese journalist who uncovered the involvement of several Maltese politicians and who was then murdered with a car bomb a year later https://en.wikipedia.org/wiki/Daphne_Caruana_Galizia
You're right, I think I'd read stories about some other journalist being targeted and killed after the Panama Papers. It seems like the latest news is that the main journalist was not killed, but people are still looking into the specifics of what happened.
I'm happy you have faith left in the system. Someone has to believe the system and unknown and mostly unelected and unaccountable beurocrats are coming to save us and not holding just enough people accountable to placate the masses. If not for this beautiful optimism, who or what would hold us back from taking both individual and collective action in replacing, reforming or ignoring said sytem after all?
Also, may I recommend that anyone with their senses left intact stop using or trusting Wikipedia a decade or so ago?
At least Iceland ousted their government at the time after the revelation. Which is why it is up to the collective people to mobilise. A government is only in place so long as the population allows them to. "People get the government they deserve." After all, there are only thousands of politicians compared to the millions of ordinary citizens.
It is pretty far off if you actually stop and think about it for even two seconds instead of just blindly parroting something only because it agrees with your world view.