It's not an issue at all, the price drop will have short term effects for Xbox One, because the preference is for Sony this generation, that's what's become clear throughout the year, even without without a price drop Sony are still ahead. Sony doesn't need one yet.
As for long term, Sony already has a tonne of exclusives lined up for next year (that's games only coming to PS4), they have 3rd party preference in the minds of more gamers this generation and they have indie games.
Sony's 1st party have been busy for ages, with more than enough time to have games ready to surprise gamers with. Uncharted 4 is coming next year, with no signs of it being pushed back, Gran Turismo has every chance of coming out next year and that's always been the biggest seller on Playstation.
PS4 has been winning the sales game and that's with only a handful of exclusives and 3rd party support, next year it will have more of both. Sony aren't cocky, the reality is that Microsoft are still behind by a big margin, the price drop hasn't given Sony anything to worry about.
