I feel like when the supposed games come out, it will too late. Xbox is handled by very incompetent people.
I don't think it really would have mattered. We've really only seen major shifts in market share when either the prior gen market leader screwed up somehow and/or someone catches lightning in a bottle.
i.e.:
Nintendo lost their dominance when the partnership with Sony fell through and the stuck with carts for N64 and alienated third parties with high licensing fees.
Sony lost some of their dominance with the $500-600 PS3 (really the latter as the non-bc sku was hard to find) to win the HD movie disc war, compounded with terrible PR saying people would work a second job to afford it. Nintendo capitilzed on that and catching lighting in a bottle with the Wii (and DS) and sold a crap ton of units and won the sales race. MS capitalized on that and dominated in North America, the UK and a few other places--though still finished neck and neck with the PS3 in consoles sold by the time the generation was done.
MS lost the goodwill and market share they had with the 360 with the terrible Xbox One reveal and then still launching with Kinect forced in causing them to be $100 more than PS4 for a less powerful machine.
None of that kind of stuff happened this time around. Sony and MS played it safe and stuck with what worked last gen and launched two very similar consoles that will run games similarly enough that most people won't care about any differences. No reason to expect market share to shift as it's only shifted historically when someone screws up or someone does something new that catches on like the Wii. MS is aware of this given their focus on services, Spencer saying consoles sold aren't the main metric etc. Unless Sony screws up they're never going to come close to them in sales again. Too much of the world just doesn't care about the Xbox brand. And that's fine, they can be very profitable with their services and I love them (and Nintendo) as a complementary platform to my Playstations that have more of the types of games I love (cinematic, narrative-drive single player games).