I'd dearly love to see such a machine, as the A1200 was a great entry level computer that the market sorely needs today.
However, in practical terms it can never happen. Such a machine would need a large production run in order to be viable, and would thus need a multi-million dollar advertising budget. It would also need a unique and high quality software base (with incentives to software manufacturers to publish titles), and a bespoke design as an off the shelf chipset would prove expensive in the long run.
Added to that is the fact that a low end PC is not much more to buy than a top end XBox/PS2 bundle, which has already squeezed out Atari, Sega and is putting huge pressure on Nintendo.
Clearly a company like Amiga and/or partners simply haven't got the resources to mount an attack at this end of the market, but I'd love to see a new generation A500/1200.