Well Sega was mostly defeated by money problems, which MS certainly has none. Now Nintendo held off sega for a long time there, but I assure you, PS2 was the nail in the coffin. So, ummm, I think the ones that would take MS out of the market would be MS. That is, if their next console doesnt produce the results they want, they may consider an action like that. It wont make a difference to them anyway.
On a related note, Nintendo likely wont be squeezed out by them, and if a day in the [very] distant future comes, they would likely by Nintendo, and Nintendo would go on.
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