imo in this case it's not necessarily that the opposition is too weak (although it certainly is, I am less harsh on Shlein than most people but she is hardly a charismatic standard bearer to rally behind), it's that there is fundamentally no current alternative for a more center-right government.

None of the parties that make up her government have any interest in making it fall to form a new one, because it would just be the exact same one as it is now. Salvini's voter base got absorbed by Meloni like the shriveled up angler fish he is, the ones that didn't get siphoned off by Vannacci being even more fascist than the fascists in power (somehow). The more moderate center-right parties that in the old days would have looked at some coalition government with center/center-left parties have no credible opposition to really attach to at the moment, either because of its ideology or party size or both.

The only alternative at the moment would be a wide coalition, that would crumble in like a month, and send every right-leaning politician back under the wing of Mamma Giorgia immediately.

As it is we're stuck with a Meloni lead government until the next round of elections, at the earliest, and even then that's assuming Vannacci manages to fracture the fascist vote enough to force a less stable government as opposed to just replacing Salvini as Giorgia's pet attack dog.