With what hard-drives are currently used for in a gaming console, I see little value in going with a solid state drive; and at the same time the (relatively) lower storage space from an affordable SSD could make it difficult to migrate to digital distribution for games.
I'm expecting that most of the console manufacturers will have a service that is somewhat like Steam which allows their users to download any game that was released for their system. If you have a 100GB hard drive, I would expect this would only allow you to download 4 to 10 next generation games.
Don't get me wrong, I fully expect these companies to support retail sales for the forseeable future; but I think that they will want to move towards digital distribution for a wide variety of reasons. First off these games can then be sold at full price and both the console manufacturer and game publisher can split the retailers "cut" increasing their revenue per game sold. Secondly, it could be argued that a lot of games lose sales because they're simply not available in retail stores; and finally, it allows them to sell most games at a discount after they have been on the market for awhile and try to 'steal' these sales away from used game sales.
