Designing an arcade machine for easy scalability requires careful planning to ensure long-term adaptability and cost-efficiency. Here are the key factors to consider:

1. Modular Hardware Design: Use interchangeable components like joysticks, buttons, and PCBs to simplify upgrades and repairs.

2. Scalable Software Architecture: Opt for open-source or easily updatable firmware to support new games and features without hardware overhauls.

3. Standardized Connections: Implement universal ports (USB, HDMI) to accommodate future peripherals and displays.

4. Durable Materials: Choose high-quality, long-lasting materials to reduce wear and tear, minimizing frequent replacements.

5. Cloud Integration: Enable cloud-based updates and leaderboards to keep the machine relevant with minimal physical modifications.

By focusing on these elements, arcade manufacturers can create machines that evolve with technological advancements and user demands.