I think worrying about sony at this stage is a bit premature. Firstly the price for the vita is a bit too steep but a price cut will soon see sales shooting up. Here in nz, the psp has been the most popular gaming device this gen and once the ps Vita drops in price, and reaches the magic figure of $250 we will see tons of sales.
Add to this, sony are clearly not putting all their eggs in one basket. Unlike nintendo, sony are willing to put their games on smartphones and are currently making arrangements with phone devs to do so. Add to this, I think sony and the playstation brand occupies a different level than iOS games in that they are deeper, more mature (hardcore??) experiences so I think they will be able to differentiate themselves from competition.
As for the ps3, I think it has gone from strength to strength. Sony have lost their exclusive 3rd party dev support but in the process have considerably expanded their own 1st party and 2nd party network and have gained a huge number of new IPs. Some have been average and even unsuccessful but a number of them have gone from strength to strength. I agree that the ps4 will probably not dominate the world of gaming the way the ps2 did but I definitely think that it will do much better initially than the ps3 and will get much better quality exclusives at launch.
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