Tom Preston-Werner envisions a future where developers can use Git on Mac computers without needing to install it themselves, highlighting Apple's proactive approach in including programming languages and version control systems with OS X. He argues that having Git preinstalled would enhance the ecosystem by lowering the entry barrier for new users, thereby expanding its user base and improving development workflows. Preston-Werner encourages users to advocate for this change by submitting requests through Apple's bug reporting site, emphasizing that increased adoption of distributed version control tools like Git would benefit the broader developer community.