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. 
The situation of Juventus worry me too much and it is looking like nothing will change about that soon. Although they tried to hold Lazio to a draw up to the 90th minute and beyond before Adam Marusic spoilt everything at the 3 minutes extra time. Even a draw against would have still been a bad result for Juventus because Lazio have been a very poor performer this season as the lost several matches this season without any sign of seriousness. Juventus is just so lucky the season have gone too far and there is little Roma and Bologna can do to kick them out of champions league spot next season.