We do indeed have the option to buy Jovic for something like 12 Million and if he insists on joining Barca we should ask 50+ from them in today´s market (he is a future world class player in the making).
Even though the lure of Barca is obviously hard to resist Jovic always made the impression that he is super happy in Frankfurt and considering his age it might be beneficial for him to stay maybe another year or two and then make a move.
Once he started to become a regular starter he really blossomed so hopefully he is realistic enough to realize that at this stage of his carrer it would be more beneficial to play regular football rather than rotting on the bench. Even though I can obviously understand that money, playing with Messi, winning titles and the overall prestige of Barcelona will maybe mess with his head.
We really need to qualify for one of the European competitions to be able to hold onto Haller, Rebic and potentially Jovic, otherwise we will start from scratch again and will have once again to rebuild.
Thats one of the reasons why it feels so hard to establish in the top teams of the Bundesliga especially when you can´t compete with the other teams in terms of money.
Once you have a decent team you can be sure that the best players will be bought so you once again have to rely on your scouting team/manager to bring in replacements that hit the ground running. If you fail to do so you did not just waste precious money but you will easily end up in the relegation battle.
Stuttgart is a prime example...they almost managed to qualify for the EL last season (we got in instead of them as we won the cup), but they bought the wrong players and are a mess right now. In addition to that they will lose Pavart to Bayern in the summer as well.