It's already there really. It's heat output on the 4 and more so the 5 benefits from active cooling. The good news is the pi is practically pointless as a product for most people these days, and vastly better options are available cheaper, so unless you genuinely need the gpio theres little reason to buy one - very much their own fault for focusing on commercial applications but the Pi 5 as a product is practically pointless for a consumer use at this point. An old Pi 2 or 3 which dont need any cooling are very useful still for a range of applications but the newer ones are in a bit of a weird niche where they're overpriced compared to most options.