Juventus lost to Lazio recently which is not good. But I think it is too early to say they won't finish in top 4. Juventus has history of coming back strong after tough losses. I believe they will work hard to keep their position in standings. Every team has tough times during season. How they deal with these challenges shows their character. Juventus has good players and coaches so I think they can do better in next matches. Let's see what will they do next. 
Absolutely, every club experiences both good and bad times. Juventus has performed well from the start of the season, but we don't know what's going on with their performance right now. Juventus has competed with Inter Milan for the title this season. I believe it is too late to judge Juventus at this moment, with the games left, Juventus still has a chance to finish the season in the top four. Juventus' current players are capable of winning their remaining games. M.Allegri's goal at this moment is to win the rest of their games and finish in the top four, because they are currently two points ahead of Bologna.
Bologna's performance this season has been really impressive, I never expected them to make it to the top four. Bologna leads Salernitana 2-0 from the first half. Even before the match started, I believed Salernitana couldn't compete with Bologna with their current form, I think Bologna will score another goal before the final whistle.
I was also quite surprised to see that Bologna continues to distance itself from Roma with a difference of 7 points and that still provides security in 4th place in the Serie A standings. Next season I am sure Bologna will appear in the UCL with Inter, Juventus and Milan.