The 'ball' is in Nintendo's court right now. Both MS and Sony have equal (if differening) problems to solve throughout the rest of this gen and into the next IMHO.
Sony...
has profitability problems. It pushed costs up on PS3 with BR and lost a year to MS in time to market. Worse, Nintendo has taken (at least for the moment) the position Sony had with PS1 and 2 - namely the console for everyone market perception.
Their library of games right now is too skewed towards 360 demographic and it does not have enough broad genre coverage, enough compelling family and childrens titles, nor enough 3rd part support.
It is caught up in a big battle beyond games for HD movies, download movies, on-demand, etc. with MS and others and has been spread thin over PSN evolution and Home by the sound of things.
So, they need to focus more short/medium term and forget marketshare as Wii is way ahead right now anyway. That means sort out games and get broader genre support. Sort out Home and LBP and get them to market. Get production costs down on the PS3 as fast as possible.
They still have good brand, they have a lot of IP overall (Jak & Daxter, Sly Cooper, etc) and a lot of 1st and 2nd party support. Plus 3rd party support for big titles is now assured thanks to COD4, AC, GTA IV, DMC4, etc. etc.
If they get this right over next 18 months they can look to growing marketshare again. They also know thanks to Wii that better tech/graphics isn't everything. Comparing PS3 to Wii its easy to image PS3 lasting 10 years with some evolution of console over that time (PS3 slim, etc). Looking at Nintendo history their next console will likely only been on a par or slightly ahead of PS3 tech anyway from graphics point of view (Nintendo never chasing high end graphics as an end in itself anyway).
I think they could take small price cuts, but anything more would just needlessly harm profitability IMO. PS3 is selling at least as well as 360 with less games and less time in market - they have time to take bigger price cuts later so long as 360 stays where it is currently, which brings us to...
MS & 360...
Is probably barely profitable in its own right (its hard to be sure with it buried in the entertainment division but if we take historic Sony/Nintendo performance and factor in the videogame industry has never been larger then MS are at best right at the start of seeing profits at this stage.
MS, despite gains made by 360, I think have serious marketshare problems if their goal is to be number 1 console worldwide either this gen or next.
Starting with Xbox MS have consitently focused on being bigger, more powerful and faster - qualities which have never made any console sell in excess of 100M units worldwide. They might rein back with their next console, but what about their core demographic? I think the major 360 fans will want (and expect) the next console to really push the envelope as well.
In short, I think MS is caught in a loop where they have got a very strong, big spending demographic in US & UK that would probably have formerly looked to PCs for their games, and will struggle to get out of that loop. It's a classic catch 22. They are so good at Live and PC like games such as Halo, GoW, etc. with big online community that I believe they run the risk of losing that very demographic as they try and gain broader acceptance.
Their very comments about owners of Wii wanting to 'graduate' to a 360 wanting a more 'immersive experience' indicate to me they don't really get videogaming outside of their core competancy.
They seem to think all these Wii owners are 5 to 14 and when they hit 15 they're going to want a 360. In some cases I'm sure that's correct, but I doubt its true of the bigger picture.
Looking at Wii sales and combined 360/PS3 sales to date I have to wonder at what real future growth 360 can show. It has increased YOY so there is more water in the well, but its YOY increases are behind Sony and Nintendo and current trends indicate to me that WW the 360 is still likely to end up 3rd - although perhaps a more profitable third place than Sony will enjoy in 2nd.
They have a great base demographic that I think they could turn into a very profitable business - but their big challenge (and one I think they're actually failing at right now IMHO) is appealing beyond their current core gamers.
If MS can't change current trends (and I doubt games are enough anymore) I think they may have to risk price cuts sooner rather than later. Otherwise they must settle for what they've achieved this gen and look to the next. The risk is that doing so might well give Sony the time to really fight back well, get back into a strong 2nd place and leave MS as a profitable but last place competitor vs its Japanese rivals.
In summary, I think the balance of power right now is actually Nintendo, Sony and MS last. This might seem harsh, but based on the above I think MS actually has the most difficult job to really grow 360 and continue to hold of Sony WW.