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Inter Milan in next season will be scary because of having these players and if they keep the player like Lukaku for the next season and hire Thuram while they have Martinez, Iner Milan will be a strong team in the attacking line with many players they can have good performance however, I guess they won't need all these forwards and the better thing to do for Inter Milan is to sell some forwards and make the team more balanced for the next season.
However, there is still the chance for them to lose their goalkeeper to Manchester United.
selling some attacking players is not the best way for me because if I look at Inter Milan's formation it seems that Inter only need to sell midfielders and after that don't change anything in the attacking line because for me Inter Milan's attacking line is already very good and we can see from the season Yesterday. and regarding which players will be sold by Inter Milan there is no certainty yet, but what is more certain is that in the summer Inter Milan will have the opportunity to replace Napoli because currently Napoli has almost lost its flagship player.Inter Milan in next season will be scary because of having these players and if they keep the player like Lukaku for the next season and hire Thuram while they have Martinez, Iner Milan will be a strong team in the attacking line with many players they can have good performance however, I guess they won't need all these forwards and the better thing to do for Inter Milan is to sell some forwards and make the team more balanced for the next season.
However, there is still the chance for them to lose their goalkeeper to Manchester United.
regarding Andre Onana, it seems that MU will not really buy a goalkeeper from Inter because MU will not be able to forget the services of David de Gea.
But you are arguing on the presumption that Inter Milan won't sign another striker very soon, but nobody can tell whether they have already plans and even negotiations going on. I think on that level no club would risk the future by stupid decisions like selling too many strikers and then not being able to find a new one. I think most of the transfers happen for a reason and they already know which players they are going to target on the transfer market.
They also are well positioned for negotiations as I think they will be playing for the title and they are also qualified for the Champions League and they can defend the Coppa Italia. That is quite an interesting project to players.