Thats true, and when Rome became and Empire they also controlled majority of the Mediterranean. I was just implying that cultural transitions are not as simple as first Etruscans, then Roman. There was in depth connectivity between cultures. Even within Italy itself, there was never a uniform Roman culture. Roman culture, as with most cultures, was extremely dynamic and was constantly influenced/influencing and integrated aspects of other cultures, even ones they annexed. The Etruscans did not become Roman, rather they culture was slowly integrated into the Roman cultural identity, with many aspects of Roman culture to have originated from foreign influence.

Edit: P.S I apologise for my long winded response. I am currently researching Etruscans relationship with Rome for uni, so I am quite passionate about this topic.