We don't know that it's several years away though. I do like you think it will be some years from now but it doesn't always happen like that. Some players have a very steep decline, Toby springs to mind. One season arguably the best CB in the prem the next not even top 10.
The physical decline of a player can never be fully anticipated. I think the model we are taking is the correct one, a younger forward in Richarlison and then the two younger players getting games elsewhere and hopefully they are able to step up to a level we require but we can't just pretend Kane will definitely go on at a high level until his mid 30s. He might well not.
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We know that he's still performing at a high level still and has age on his side given the life he leads and his professionalism, he could decline sharply for reasons but until that happens we won't be bringing in a replacement just on the off chance it does happen.