I would argue that we have that today in the form of the Apple MacMini (https://www.apple.com/shop/buy-mac/mac-mini) -- the Commodore 64 was priced at around $300 in 1984 or $950 in 2025 money. The basic model MacMini comes in at $600 today. For that you get a fully Unix system with a full development suite to build desktop/mobile/Unix apps out of the box. Every development platform is available (C/C++, Python, Swift, JavaScript, Java, Rust, etc.) on it. The expansion system is extremely simple also (USB C/Thunderbolt). Not to mention it is much smaller than a Commodore 64 and arguably more user friendly.