Well its always a sad thing when studios get closed. But i think its the right move by Sony. Sony must support studios like Naughty Dod and Santa Monica Studios which bring citically acclaimed games which sell.
And Zipper on the other hand doesnt bring anything great in the last years. All there games ( Socom 4, Mag, Unit13) werent big sellers and only mediocore. So i personally see no reason why Sony should support them any longer.
On the other hand Team Ico also havent any big seller but they bring unique experiences.