Should we wait to see if Pogba leaves to decide on Felix? I wouldn't be against buying now, our attack lacks quality technical players.
As many have pointed out, he isn't a natural right winger, so won't be bought for that spot. But he is versatile and technical enough to bring something to our attack across the front 3.
Assuming Sanchez and Lukaku are let go of this summer, I wouldn't mind bringing in Sancho and Felix in their stead.
Having Martial, Rashford, Sancho and Felix makes for good competition for 3 attacking positions (Chong and Greenwood also integrated to the squad as understudies, in case of injuries, lack of form). What we would lack is experience, but we currently have none anyways upfront.
It also gives us options in terms of formation/tactics. The 433 can be played with outright attacking wingers (Martial and Sancho either side of Rashford) or playing with a false nine if Rashford is injured/out of form, with Felix coming in, and Martial and Sancho playing a bit more narrow.