Not really...
If the new memory is needed for AI data centers, it doesn't matter if your existing MacBook doesn't need as much memory anymore.
If the existing MacBook needs less memory, it can use its current memory spec for higher-level uses that formerly required a MacBook Pro. That meaningfully affects the market.
If the existing MacBook needs less memory, it can use its current memory spec for higher-level uses that formerly required a MacBook Pro. That meaningfully affects the market.