Their [appropriate] response is to divest.
It's an unattractive market and they have low differential advantage.
what about remote play? and wouldn't PS+ be negatively affected in terms of appeal if it keeps the same price but lose 1 device that can take advantage of it? Plus, in Japan even a dead Vita is still as relevant (so far) as PS4 (in terms of LTD's number, PS4 will probably catch up with Vita in late '16 or even later, right?)