I don't think goals from midfield is a long term issue. Keita and Fabinho needed time to bed in and will be better next season. Henderson playing further forward could easily happen more often next season. Ox will be back. Our defence contributes more goals and creates more as well.
A much bigger issue is beyond the 4 main strikers. Sane, Sterling, Aguero and B Silva are about even with Salah, Mane, Bobby, and Shaq. But man, Sturridge and Origi get absolutely crushed by Jesus and Mahrez. That's really all it is between us.
As much as I like Origi and Sturridge, the numbers don't lie. They have to be upgraded.