No way. Young players who are potentially very, very good definitely need to be replaced.
You may not need to replace their performance in the immediate term. We're well stocked with Richarlison, Lookman and Onyekuru all playing down the left too, so you might not need to spend that money in the same position either.
But we do need to replace that potential *somewhere* and that does cost a pretty penny. Long term we need to be maintaining/increasing our number of under 23 players, not reducing it, and that will involve spending plenty of money. It's short-sighted not to.
Yes, selling short is always selling short. And if Lookman is someone who is currently in Silva's medium and long-term plans, then yes, he needs replacing. Players get injured. Players improve to the point they force transfers. Depth and youth are essential. If you have someone like Lookman who you believe will be a good, attacking player, you don't give him away easily because he pisses off a handful of fans or because he really wants to go and the Germans claim poverty.
And I will keep accepting Gash's tools every day forever for saying so (without reciprocating), it seems. No hard feelings.