Competition drives innovation. Furthermore, if there were only 1 choice of available consoles that would basically be a monopoly and the people selling it could potentially sell it at very high prices. No, it would not be a good idea. Look at Windows 8. Microsoft already has the attitude that because they hold the most market share of computers using their Windows software, they can dish out anything they want to their customers and they will buy it. And it's actually true at this point. Millions of little sheepie have already purchased Windows 8 because they feel like they have no other operating system to go to. They panicked. 1 console maker? No. We don't need 1 maker of "anything". Very bad idea.
I want Microsoft and Sony fighting over me. Not just having them sitting around in a leather chair, smoking their cigars with their feet up on their desk, waiting for me to come to them saying, "Don't worry, they'll be here. They have no other choice."
Did you happen to see how fast Microsoft did a 180 on their decision to restrict used games being played on their console and their always online requirement when Sony exploited this shortcoming to the world? That's what competition does for 'YOU'. Wake up.
Do you see Microsoft doing a 180 degree turn on Windows 8? Hell no. They're gonna drive that car straight off the cliff because of people's limited mindset and Microsofts "where else you gonna go" pitiful attitude towards its customer base. The same customer base that made Bill Gates a billionaire.