From what De Rossi has shown since he coached Roma since Jose Mourinho left I think there is nothing to doubt, De Rossi has exceeded many people's expectations but regarding the future will be better or not that no one knows we just have to wait for next season when De Rossi builds this team according to his wishes.
I saw some of Roma's transfers and I think it's good enough so that they will most likely be better next season, I'm quite optimistic about that.
De Rossi was indeed able to make Roma improve rapidly last season. And well it exceeded everyone's expectations. But last season De Rossi only continued the squad that had been formed by Jose Mourinho. Meanwhile, the real challenge looks like it will start when this season starts. The Roma squad this time was actually formed by De Rossi. Even though many of the players are still the same, several additions have been made in the transfer market. And I think it is indeed a very good player transfer. Moreover, I like their new striker who was Laliga's top scorer last season at the Girona club. I don't know what De Rossi said to the player, but I applaud De Rossi for succeeding in convincing the player to move to Roma.
De Rossi probably can do very well if he starts to build a squad for himself. You know, last season he did a very good job with a squad that he did not even build. To be honest, I expected better from Jose Mourinho but he kind of disappointed. I did not expect De Rossi to do much better either. But what he did indeed surpassed the expectations of everyone.
De Rossi also signed a winger from Juventus, he is slowly building a squad. I am expecting him to finish top 4 this season. What he did last season was exceptionally well and I believe he will be able to get the UCL ticket for his team in the next.