That "crazy old man" (Paolo Savona) is an economist, academic, previously minister for the economy and he is now the CONSOB president, so trust me he is not crazy, he has a better CV than both of us combined, it's just that you disagree and your view of him is overly simplistic. Furthermore I don't see what right the reactionary Mattarella had to veto him, but that's another story.
Nevertheless, even with the best intentions no party/government has the right standing and foreign support to leave Europe succesfully, even the yellow-green government didn't have any actual chance. If we try, the best we can hope for is a scenario a la Tsipras' Greece.
That's why I don't believe there's any chance that Meloni will attempt something like this, and even if she promises Italexit and a majority of Italians votes her for it, the reactionary Mattarella will stop it. No worries, Italy is a democracy only as long as people vote "correctly", and by correctly I mean in a way that doesn't scare the markets.
Seriously, calling "crazy old man" someone who's done more in their life than you will in 5 of your lives is some interesting form of coping.
And if he want to exit from Euro, he and the parties that supporting him, they must say it explicitly in front of the Italians, instead that be foggy about the topic and prepare hidden plans to be implemented overnight.