Switch more than 5:1 over the Xbone, and regularly shaving 200k off the lifetime gap per week.
Gears 5 should give the Xbone a boost next week, but at this point I don't think anything can substantially alter its trajectory.
The thing is though, Switch and PS4 sales go up and down by around 25% in a week so you see the Switch ranging from 190k-250k with various new games or new hardware and that system is the big thing right now, if the Xbox was to fluctuate upwards by 25% of its current sales with the release of Gears you have it normally ranging from 50-60k so.... if it jumped by 25% that could go as high as.... 75k? I mean... if the sales from Gears caused the system to start selling 100% more every week that would mean that weekly would rise to 100k and that's still 150k less than the Switch cruising speed right now, I've said this for a while now, but the X1 as a system is dead, it went into that death spiral last year and is well past the point of recovery to any meaningful weekly numbers.
I would more see Gears as being like Breath of the Wild was to the WiiU, a nice gesture for the players who had the system but realistically it's not going to attract people to buy what's clearly a system with no future at this point in the Generation, not the base model at least, it could shift a few X models to people who want to play gears... but didn't like Gears 1 Ultimate or Gears 4 but now they have come into some cash or so and want a powerful machine and Gears 5 is enough to push them over the edge to make the sale, but.... that's a very small increase in sales I'll bet. This kinda goes back to things like new Forza games potentially selling more Xbox1's I mean.... Forza Horizon 4 came out, did they think it would make people buy the system who weren't sold on buying it when Forza Horizon 2 came out? Or Forza Horizon 3? Or Forza Horizon : Fast and the Furious, or Forza Motorsport 5.....6 or 7?