Sony has nothing to worry about, PS4 will have had The Order 1886, Bloodborne, Until Dawn, Tearaway Unfolded, Kill Strain, The Tomorrow Children and Fat Princess Adventures for outright exclusives on the system.
Out of all of those games only 2 are from established franchises, the rest are entirely new and fresh IPs, way more likely to draw in new gamers to the platform.
As has been shown over multiple releases Halo isn't so much a system seller as a game that can move units of software, but the install base is already on the platform.
Halo 3 released on the 25th of September 2007, on the 22nd (the end of the week prior to it's release) 360 had sold 164K, the week after Halo 3 released (ending the 29th of September) 360 had sold 234K, despite the game selling 3.8M copies the console only moved an extra 70K units of hardware, not what anyone should be calling a system seller.
Looking at ODST, that game released on the 22nd of September 2009, on the 19th 360 sold close to 130K, the week ODST released 360 sold close to 148K, so the system only sold an extra 18K despite ODST selling 2.2M units.
Reach came out on the 14th of September 2010, the week of the 11th 360 sold 158.6K, despite Reach selling 3.69M the console only managed to sell 264.4K units of hardware for the week ending the 18th of September 2010, so 360 only sold 105.8K more because of Halo coming to the platform.
Halo 4 came out on the 6th of November 2012, the week ending the 3rd 360 sold 264.9K units, the week ending the 10th 360 sold 379.8K, despite Halo 4 selling 3.6M units of the game, it still only sold 115K units, not really a system seller considering the game sold millions of units.
I doubt Halo 5 will buck the trend and move even a quarter of a million XB1's.
I don't get where this belief that Halo is a system seller comes from, the game sells because the install base is already on the platform, if that's the case the it sells to existing XBox owners, but not because the game is coming to the platform.
I wouldn't be shocked if much of these sales were the result of COD being more popular on 360 last gen, still the current install base of XB1 will be the majority of the people that buy Halo 5, with maybe 100K more for the week the game releases, that's what tends to be the case with halo when it releases on XBox.
The global sales are all that matters, Sony has more new exclusives releasing this year, they have the Marketing deals for the major 3rd party games and Sony are still yet to announce a price cut, which could easily happen at Paris Games Week in time for the Holidays or just randomly as we go into the Fall, which happens on the 22nd.
FYI Forza 6 isn't a Fall release, it's a summer game, releasing on the 15th of September, Fall begins on the 22nd of that month, if you're going to count games that release before Fall as Fall games then Sony has Tearaway Unfolded and Until Dawn, along with Kill Strain and The Tomorrow Children, it's hardly a lacking line-up, in fact it's way more diverse than a 2 highly milked franchises from Microsoft.
Fable Legends releases on PC, so it's not an exclusive, if you're going to count games releasing on another platform then Sony also has Persona 5 and Dragon Quest Heroes.
Sony's line-up destroys Microsoft's, I'm sure the sales will reflect this, just as they did globally the last holiday.
