Would be dumb on their part. If I'm in Sony's position I ain't dropping shit I'm reaping it. If MS do price match I'm adding a game and probably a ps plus bonus.
I suppose it depends on Production costs and PS+ tie rates, if those align then $299 could be a reasonably small loss, their analysts could indicate that dropping to $299 earlier would allow a higher install base earlier in the generation, which would mean more expensive and thus less 3rd party exclusives from MS and the "everyone has a ps4" mentality allowing them to stay at $299 later in the generation. So a kind of losses now for gains later mentality. But I doubt it'll happen, IMO, Sony will offer:
Now: Infamous Bundle £385
27 May: Watch Dogs Bundle £375
July: Knack Bundle £350 or Knack+TLoU £375
September: Destiny+Knack £375 Destiny and 1 year PS+ £399 Knack £349
Xmas: TLoU/Destiny/Knack £385
Or something to that effect, Also in November I think maybe they will start a PS+ campaign and advertise with titles such as AC4.