My personal thought is that if the Arduboy gets a gyroscope and vibration motor, it will likely be priced too high to succeed by any measure. Once you approach $65, a budget Android tablet looks pretty good, with specs that clobber anything in the Arduboy discussion. You get the WiFi, Bluetooth, color, SD card, better resolution, and more storage. You get a massive library of software.
Arduboy fills a niche. It's a very nice niche, but it has its limits. If we overflow the niche, we compete with a massive tech capability already in the market. This is not a major producer we're dealing with. Scale will not be 10 million units. The parts pricing will be good, but not at full industrial scale.
My mental model is that the Arduboy is the decluttering approach to a handheld system. Drive for simplicity, avoid complexity. Schumacher applies here: small is beautiful, both in physical design and internal thinking.