But the flush toilet can only be invented once. We might have access to talking super toilets with multi-coloured fountains - but all the bells and whistles are less useful that the original flushing toilet aspect.

how about a teleporter combined with a toilet. It could sit somewhere in your house, scanning your bladder and colon periodically, and then removing accumulated waste without you having to do anything. While it is doing that it could also remove any viral particles or unhealthy bacteria from your bloodstream, excess ear wax, unwanted body hair, tumors, arterial plaques, unpleasant memories, etc. THAT would be a real innovation!