The thing with Backwards compatibility is that the costs are usually going to out weight the gain. Console makers don't make a huge amount of profit off the sale of consoles. They however make the majority of their profits on the sale of software. BC brings absolutely no potential for software sales profit since that software is almost exclusive to the second hand market.
In the case of the PS3 the cost of (re)adding BC will probably not be offset by the increase in console sales it would bring about. Now, it might work, if it were added in the way the OP suggested as it could be priced in such a way that it would pay for itself, and I would seriously consider buying it as DLC.
As a standard option in every console sold, it doesn't make sense.
In the case of the PS3 the cost of (re)adding BC will probably not be offset by the increase in console sales it would bring about. Now, it might work, if it were added in the way the OP suggested as it could be priced in such a way that it would pay for itself, and I would seriously consider buying it as DLC.
As a standard option in every console sold, it doesn't make sense.