Why do people think having the most powerful box on the market will turn MS into the industry leader again? When has horsepower alone ever done that for a console manufacturer?
The main correlating factors always seem to be price and release date relative to the competition. The PS2 was the weaker than the GCN and Xbox but launched before them (though for a higher price than the GCN), while the PS3 launched after the 360 and at a higher price and ended up costing Sony a ton of market share. With this gen, MS and Sony released at basically the same time but Sony had the cheaper console, and the more powerful hardware just made it an even better value compared to what MS was offering.
I don't see Scorpio, with its boosted specs, launching at the same or lower price point as the Neo, and it's going to do so an entire year later, which is more analogous to the position the original Xbox and the PS3 were in compared to the competition in their respective generations.
On the other hand, MS may end up mixing things up a bit by turning the Scorpio into the first console of Gen 9 and trying to replicate the successful 360 that kicked off a generation before the competition, only with perfect 'last gen' XBOne backwards compatibility. It seems like a significant enough leap in power, and MS has only promised that XBO games and accessories will all work with Scorpio but never promised the reverse. If they line things up that way and stack the Scorpio as the first true Gen 9 console against the Neo, which appears to be a half step more firmly rooted in Gen 8, they may be able to swing things in their favor.