Martial is one of the players who is currently on the sell list from Manchester United and Rashford we know that he is only an option because he is not a pure striker so indeed only Hojlund is currently Manchester United's hope.
To be honest this is like gambling because it is like making a bet on a young striker but they will definitely continue to try this at least to see how Hojlund plays later as if he is not up to expectations then Ten Hag will likely look for new alternatives in the winter.
Currently there is no other choice for Erik Ten Hak but to wait for Hojlund to recover from injury and several trial schemes carried out by the coach none of which ended well even though it didn't look so bad. Martial has not been at his best so he is on the sale list and Rashford is more developed playing on the left wing instead of in the center striker. It will be interesting to see how Hojlund will perform after recovering from injury and whether he can improve with Ten Hak's strategy or will follow his partner Martial.
I think when we flashback to the previous few weeks where the initial statement was that Hojlund might be out for 3 weeks I think it's now possible that he has fully recovered and can play against Arsenal this week but there is still no further confirmation on this and the hope is of course that he can compete so that their attacking line has additional ammunition.
On the other hand, I saw some reports that Manchester United are not planning to bring in new players even though some players are still in the treatment room because besides Hojlund they are currently missing Malacia, Shaw, Mount and Varane but they will miss out on bringing new players to Old Trafford.