Arcade Mode is not what was wanted. Full game against BOTS is what is wanted.

I wonder if the consoles could even handle the AI of 40 bots. It's pretty straightforward in Arcade where they just look for enemies to shoot, but having them go for the objectives in a way that's smart enough to provide a challenge for the player is something else entirely.

That said, the old games did it just fine, but I once played Team Fortress 2 (another objective based shooter) with bots and that was a lot more CPU heavy than playing with other players.