Y'all have heard about Sony getting ready to put in the cross-game chat thingee right? Sony is building up the PSN steadily. If Sony keeps doing well in the marketplace, they will force MS to stop charging for its XBL.....basically making them cut the price which will be a big blow to MS's revenue.
The PSN gets better and better all the time....we have the huge MAG w/ zero lag, soon we will have the cross game chat......MS is sweating for something new to add to its XBL but its only possible to keep adding worthwhile stuff for so long. Eventually you will stop being able to differentiate yourself w/ features (like XBL can....for now) and content, and will have to compete with price as well.