As long as he continues displaying flashes of his potential ability and does not prove to be a burden to the side anytime soon then i'm all for him continuing in the first team this season if that means that we'll see a higher level of performance from him on a more consistent basis next season. For me, the little flashes of brilliance that we have seen of him thus far are reason alone to stand by him and be patient.
He is not be up to the level of some others in the side at the moment in terms of general play but that does not necessarily mean that he is a liability or not contributing to the side at the minute. His pressing, tracking back and general work rate in the side are probably only second to Harry Kane. All attributes that are key to Poch's system.
I still regard this season as his bedding in season, last year is a complete write-off as far as i am concerned when you take into account all that occurred in and around the club and his personal situation to boot too. We've all seen what a season can do for the likes of Eriksen and to a degree Chadli, let’s just hope the same pans out for Lamela too. Also worth remembering that even the best struggle at times in their debut seasons, just take a look at Surarez at Barca now, Falcao at Utd and even Modric a couple of years back in his debut season at Madrid.