What evidence do you have that this was just about bribes about visa requirements? There are new accusations of corruption against Kaili regarding separate alleged misuse of funds assigned to MEPs to pay their assistants. "There is a suspicion of fraud detrimental to the EU budget, in relation to the management of the parliamentary allowance," a press release said.
https://www.dw.com/en/amid-qatar-scandal-european-parliament-pledges-reform/a-64115509
And from the OP story, the German minister of foreign affairs, said the crisis had put the “credibility” and legitimacy of the EU on the line, and called for meaningful reform. Michiel van Hulten, director of Transparency International EU, blames a “culture of impunity”, with which he has been familiar ever since his own days as an MEP in the 1990s.
So, for many, this culture of impunity within the EU, is not new, nor the outcome unexpected. It is the issue of trust that is a danger for the EU. This time, so far, the commission has not been implicated, but if it were to be, as under Santer, then that might be a serious threat for the EU. In 1999, the EP facilitated the mass resignation of Santer's commission but if the EP is now sufficiently corrupt, then it might try to protect an equally corrupt commission.
Whatever, I'm sure the truth will take ages to come out - if it ever makes it that far.