Perisic may not be a long term answer but he affords us time if he stays and we can be looking at whose coming off contract in the next 1-2 years. The question is whether or not we're convinced that Sonny can play in the middle of the pitch against the top 6. My gut, which has been wrong on plenty of occasions, is that Sonny thrives when his primary concern is what is in front of him. He's still good in tight spaces for short periods but i can't say that i've had the impression that he is consistently good when he's in a crowd.You make good points - but my opinion really breaks down like this - I like Richarlison in this role, and think he is capable of producing goals, and also setting up others. I also think Son might be better suited for the striker role, than the winger role - so, if we are looking for that moment of brilliance - its more likely to come from Sonny, who can be clinical, than Richarlison.
Then it comes to Scarlett and Veliz - I really like both of them in this role, long-term. So, if we brought in a striker to compete with Richarlison - we could be blocking Son from playing that role, and Scarlett and Veliz from showing what they can do. And, I think that a lot of this role requires the kind of youthful energy and tenacity that Scarlett and Veliz will both bring - even though they both lack experience.
In an ideal world - we keep Kane, and if he signs a long-term deal next summer, I would sell Richi, and let Scarlett and Veliz back up Kane.
But bring in a good winger now - and we have Son's long-term replacement or competition for Kulusevski right now. I love Perisic - but he is not a long-term answer at that position. And we can still use Son as the striker, if we need to find minutes.
Bring in a striker, and we still have no long-term winger solution.