If we sell him now what was the point of buying him in the first place?
The point of buying youngsters (with great potential) for our academy is like buying a lottery ticket.
The more tickets you buy, you have slightly higher chances to eventually "get something".
If you buy only one highly rated youngster, you have only one player to look for.
If you buy 10 youngsters, you have 10 potential chances to finally create 1 youngster who will be a starter in Barca.
Halilovic, Lee, Denis Suarez and similar players, they all have lots of potentials, but it is extremely hard to tell at the age of 16 or 18 which one of them will turn into a La liga midtable team player and which one will turn into a new Iniesta one day.
In some time periods, we will be lucky with these recruitments and we will get 1-2-3 gems out of 5-10 bought youngsters.
But sometimes, there will be periods where we will get 0 players from those investments.
So, with these examples, we are doing what Ajax, Porto and others are doing.
We buy a highly rated youngster, we train and develop him, and then we see what we will get:
1. unplayable player (lost money from an investment)
2. player whom we will sold and earn 5-10-15 Millions in total (earned money from an investment)
3. or, if we are lucky, we will create/develop a player for our 1st team who cost us almost nothing in the first place (bingo!!)
My post doesn't have too much with Halilovic in particular, this is a general reply.
No matter what will happen with the current generation of youngsters, we will continue to develop players from La Masia and play a lottery game with 2-3 highly rated foreign youngsters each season.
Then we will play them in a Bteam or Juvenil teams and eventually they will either get chances in Ateam or on loans and that's it.
So, for the end, in shorter:
If we sell him now what was the point of buying him in the first place?
We tried, we took a risk.
(again not about Halil), in one moment the board and the coaches will decide whether it is time to sell a player or give him more chances.
For example, with Adama, the board decided that he is not (or probably won't be good enough ever), we sold him, and continued our "lottery tickets" with some new youngsters.
Then Sandro and Munir got chances, and now after one season, Sandro will 99% be sold since he is not good enough, and Munir will either get some more chances or he will get sold eventually and the board will move on to some new "lottery tickets".
If the board would actually sell Halilovic THIS summer, that would only mean that they think that he is not what our team is looking for (or not good enough for our needs), and that would mean that we are just moving on towards new players/risks.
On some seasons those youngsters will turn into Adama, Sandro and Munir.
On some seasons, those youngsters will turn into Messi or Iniesta.
And again, we never know how a player will develop, so we are just repeating the same process of buying lottery tickets over and over and we are hoping that we will get lucky one day again, the same as in the last 5-10 season with that golden youth generation.