A plurality (36%) says that the Alfa name should be retired. I sympathize that new Alfas will never be like the Alfas of yore but "you can never go home again". Alfa has had many ups and downs in 100 years. I hope the world doesn't give up on it and it lives to write a new chapter.
The next group (27%) would favor a tie up with Mazda. Mazda has slipped into Alfa's former market in some ways by making fun-to-drive, light-weight sedans and roadsters. It also has a nice RWD platform that the (recently-discontinued) RX-8 and MX-5 share. The rotary engine is a good display of commitment to interesting technology which is an Alfa trait. (Not saying that Alfa should adopt rotary engines though!) However, Mazda is too small to stand alone. Now that they have lost their relationship with Ford they are looking for a new "dance partner" which could be Fiat in the form of Alfa. The bad news is that, in the US at least, Mazda suffers from sub-par reliability and spotty dealer service, two things that Alfa needs to avoid assiduously.
The next group (22%) favors continuing sharing platforms and components with Fiat. I am not sure of the reasoning here unless it is that Fiat is Italian and so should Alfa be. But in the world of global branding and sharing I am not sure what being from one country means anymore. Also, it is unclear Fiat has a RWD platform for Alfa to use.
Chrysler does have such platforms but the philosophy of Chryslers as large luxury American cars seems anathema to the Alfa ethos of lightweight sports sedans. Although it seems Alfa's will be getting the Chrysler Pentastar V6 engines (as will Jeeps) which is said to be better than the (modified) GM/Holden V6 that Alfas use now. There are still rumors of a bespoke Alfa V6 being under development, perhaps the engineers can summon the spirit of Giuseppe Busso for guidance.
As for Audi/VW they don't have much to offer Alfa EXCEPT wads of cash to develop new platforms and engines for Alfa. If they bought Alfa would they do this? Lambos use Audi V10s, so maybe not.
I should have added Maserati to the list. Using Maserati/Ferrari parts would make for nice cars (see the 8C Competizione) but would price Alfa out of the mid-range market. If Alfas are to be sold at joint Fiat dealerships here in the US then this is a no go. Five years ago there was an idea of selling Alfas at Maserati/Ferrari dealerships but that idea seems to have been abandoned.
As always, money will decide the fate of Alfa. (Insert a silent thanks to Nicola Romeo here.) A tie up with Mazda may just bring sufficient economies of scale to keep our beloved marque alive.