The original Pis are still for sale, are cheap, and still do everything you need. This doesn't conflict with an expanded product line. The whole reason for Pi is still GPIO plus general purpose computing. AI is now a part of general purpose computing, so it only makes sense to adopt it too.

The things you can do locally with AI now are amazing. For several years there's been multiple open source products that can do both audio and visual processing locally using AI models. Local-only Home Assistant is almost equivalent to Siri. The more things you throw at it, the more computing power it needs (especially for low latency), and that's where the dedicated GPUs/NPUs (previously ASICs) are needed. And consider the expanded use cases; drones and robots can now navigate the world autonomously using a $150 SoC and some software.