Silvio Berlusconi’s failed attempt to topple the Italian government has left him weaker than ever, zapped of the aura of invincibility that has surrounded him for two decades as he faces the possible loss of his Senate seat and a ban from politics.

Still, it is unlikely to be his last act.

The 77-year-old three-time former premier staged one of Italy’s most stunning political plot twists in memory Wednesday when he took the Senate floor at the last minute to announce that he would, after all, support Premier Enrico Letta’s government in a confidence vote.

It was a face-saving measure that came after key loyalists in Berlusconi’s center-right party refused to follow his bid to collapse the coalition government as fallout over his tax-fraud conviction. The conviction carries a four-year prison sentence that endangers his role as a legislator.

“We have decided, not without internal strife, to vote in confidence” Berlusconi said.

Though he tried to look magnanimous, it was the billionaire media mogul’s first-ever defeat within the party he founded and which has achieved electoral success largely through his personal appeal.

Berlusconi’s retreat bestows a measure of stability on Letta’s 5-month-old left-right coalition which won confidence votes in both houses and faces the daunting task of trying to revive Italy’s economy. And though Berlusconi was left bruised and battered, political analysts argue he is not yet out of the picture.

“Berlusconi is not finished,” said Roberto D’Alimonte of Rome’s LUISS University. “This is another step toward the end, but it is not the end yet. The end will come with a major electoral defeat.

“He has great resources. He has media resources, financial resources, the resources of the 6 (million) or 7 million voters who will follow him down the abyss. That is why he cannot be counted out, even with his options being closed.”

Whether Berlusconi can ever again face the electorate is far from certain because his legal woes are narrowing his ability to maneuver.

His appeals over his tax fraud conviction were exhausted this summer, and he now faces a prison term, the loss of his Senate seat and a political ban that will bar him from running in new elections.

A Senate committee is due to vote in the coming days on whether to recommend stripping Berlusconi of his seat because of his four-year sentence. A 2012 law bans anyone sentenced to more than two years in prison from holding or running for public office for six years.

Separately, a Milan appeals court will decide later this month on the exact length of a political ban, from one to three years, that was included alongside the four-year sentence in the tax fraud case.

Berlusconi also must decide if he wants to serve his sentence — reduced to one year due to a general amnesty extended to first-time offenders — under house arrest or by performing social services, a choice that will affect his political reach.

Beyond that, Berlusconi is appealing his seven-year sentence on a conviction of paying a minor for sex and forcing public officials to cover it up. That sentence, if confirmed, carries a lifetime political ban.

Naples prosecutors also are preparing charges against him for allegedly paying a lawmaker to pull support from a former government of ex-Premier Romano Prodi, a move that seriously weakened that center-left government.

Berlusconi has claimed his innocence in all these cases, and alleged that he is being persecuted by elements in the judiciary.

D’Alimonte said it is a foregone conclusion that Berlusconi will lose his seat, sooner or later, due to his legal problems. “He would have lost his seat even without the government crisis, so nothing has changed,” the analyst said.