I believe that reaching 1 million will be important and symbolic enough. I don't think by then the news will be that, that 1 sat=$0.01, but that 1BTC=$1M.
That's very true that all the attention will be on Bitcoin hitting $1 million. I just notice no one ever brings up the fact that Bitcoin hitting $1 million means a sat would be worth 1 cent so it's just an interesting fact. I think the sat to cent parity will be talked about much more once people actually realize it but still it won't overshadow the commotion of Bitcoin hitting $1 million.