Sentimental value aside, the most simple reason for Hamilton switching to Scuderia Ferrari is the fact that they're closer to beating Redbull under the leadership of Fred Vausser, who was his mentor in F2 and F3. Compared to Mercedes's backward no-sidepod car concept, Vausser is bringing in engineers from both Redbull and Mercedes. It's not only a good marketing tactic for Hamilton, but it also lets him end his twilight years with a bang. After driving for McLaren and Mercedes, the iconic Ferrari is the natural next step.
Ferrari saw a huge bump in stocks even before the announcement was official which only goes to show how big of a financial move this was. Unlike most F1 drivers, Hamilton has immense star power which attracts sponsors and investors alike. Reminiscent of Michael Schumacher's switch to Ferrari in 1996, Hamilton is bringing engineers with 18 years of experience in Mercedes. The due of Hamilton and Charles Leclerc will arguably be the most dominant one we've seen in years. With their current track record, a consistent front-row lockout doesn't seem impossible.
Mercedes however, loses their identity and star driver, who has represented them for the past decade. They lose both sponsors and fans who are loyal to Hamilton as a brand. This change sets back their championship plan by years, as George Russel, despite being a young gem, needs time to grow to contend against the top drivers. Mercedes will likely attempt to grow a new portfolio with young drivers, such as Alex Albon and Andrea Kimi Antonelli. However, the now-free Carlos Sainz could also provide valuable experience to Russel and Mercedes as well.
Though it's too early to predict 2025, we can expect to see Lewis and Leclerc forging their dynamic to contend for the constructors championship. Seeing as 2026 will have new regulations and new teams, that creates opportunities for the duo to topple Max Verstappen and Red Bull off his throne.
The current year of F1, however, will be one of redemption and proving a point. With the same driver line-up as 2023, the whole grid gets a rematch. With the threat of Hamilton switching to Ferrari, the dominant Redbull team will be ruthless in competition once again. The rising McLaren duo will need to prove themselves once again, with lots of expectations on the young Oscar Piastri under the wing of Lando Norris. Drivers like Albon and Sainz will be in unforgiving competition for the open Mercedes seat next year. But for now, all we can do is speculate and wait for the next "It's lights out, and away we go!".