It's already very cheap to build though. We are able to pack a ton of processing into a tiny form factor for little money (comparatively, ignoring end-consumer margins etc.).

An earbud that does ANC, supports multiple different audio standard including low battery standby, is somewhat resistant to interference, can send and receive over many meters. That's awesome for the the price. That it has enough processing to run a 33 year old game.. well, that's just technological progression.

A single modern smartphone has more compute than all global conpute of 1980 combined.