Is Vialli really that bad btw? Looks like he did a pretty decent job with Chelsea when they weren't strapped.
He actually was pretty good with chelsea. I think he won like 5 trophies in 3 years with them (including the european cup winners cup) and was the most succesfull chelsea manager in their history (back in those years).
He'd be an upgrade over Ferrara definately but still a risky gamble. He worked with two different clubs where he had a pretty good impact on one and a bad experience with the other club (so you never know how things will turn out with him).
Hiddink is the safe option, he has more than 20 years experience where he worked with many different teams and he's done a pretty great job with most of them.
We're in a fucked up mess so we just can't take any more gambles right now.