Udinese and Frosinone shouldn't relegate because they have modern stadiums. I hope that will trigger other clubs. Frosinone especially because they are developing our players and play quite good football.
I think Salernitana, Hellas (they sold half their squad in winter market, but sad to see no Verona club in Serie A) and Empoli will relegate. I have to say Sassuolo can relegate in my opinion. Last years they didn't use young players nor did good scouting, so it is a bit of a 'grey mouse' club without history or exciting players, nor a good stadium. Maybe it is good for them to just relegate for 1 year. There is enough money to come back in Serie A.
Serie B looks interesting. Big chance Parma will go back to Serie A again. Some other great historic clubs in top 8 (play-offs spots) like Palermo, Brescia and some clubs I like as Catanzaro and Venezia.
Como, Cremonese and Cittadella are also in top 8, but not Serie A worthy imo.