Not necessarily. If the Xbox One had a slew of exclusives, especially new IP's, that were all extremely highly acclaimed, Eg Uncharted 2, Last of Us type levels, along with a further price drop, I think many gamers would consider picking it up.
I think games like Uncharted 2, MGS4, GOW3 and Little Big Planet really helped the PS3 gain momentum. But it took time, it certainly wasn't an overnight thing.
The Xbox One definitely has some solid exclusives, but nothing that's really demanded attention because of immense critical reception, not even in the way certain Xbox exclusives did last gen with games like Gears of War. But a similar issue is facing the PS4 so far as well. With the exception of maybe Bloodborne, none of its new exclusives critically truly stand out, and I think it sort of takes that for an exclusive these days to really grab the markets attention and lift off, against the onslaught of mega selling multiplatform titles.