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So Ratchet and Clank has sold more in 2 weeks than Quantum Break did in 3 weeks.

Will Gears be the only console exclusive that actually sells well? Are X1 owners going to step up and buy games?

Also world wide hardware PS4 sales are now consistently 2:1 to Xbox One. While in Europe it is 3:1 or more.
In terms of software sales, world wide the PS4 is selling just under 3:1 to X1.

Is X1 going to be seen as a viable sales platform for game developers with that sort of difference in the future? If it grows to 4:1 or 5:1?

In the USA market more software has been sold per Xbox One consumer than per PlayStation 4 consumer relative to their installbases.

As of March 2016 NPD, Xbox One has a 5.3 physical-only tie ratio, while the PlayStation 4 has a 5.2 tie ratio.

The strength of the USA market alone is enough to compel game developers to continue support for the platform regardless of how it's performing outside of the USA.

And there are even some titles where US LTD sales are greater for the Xbox One SKU....for example, when you look at the standalone software market, Call of Duty: Black Ops III has sold +5% on Xbox One vs. the PS4 version.

Another example is Star Wars: Battlefront, where the Xbox One version has outsold the PS4 version by +12%.

Once April NPD numbers are released you'll see a shift in the Call of Duty numbers.

Basically 32.5% of the Xbox One userbase bought CoD while 34.5% of PS4 users bought it by the end of April. A clear 2% lead by the PS4 because CoD continues to sell there, while sales are dropping off steeply on the Xbox One side. 

The argument that Xbox fans buy more games doesn't stand up this generation, in the long term. The fact that exclusives are now multi-platform, on Windows as well, will cannibalise the Xbox One software sales. This trend is starting in April and will continue for the rest of the year. It was obvious this would happen.  Will an updated Xbox help???  I doubt it, the damage may be terminal. 

Thanks for the info. If possible, how much of the tie ratio for both consoles is exclusives?

Also worth noting that the tie ratio for PS4 has jumped from 5.8 in March to 6.0 in April, while Xbox One has gone from 5.9 in March to 6.0 in April world-wide. As the months roll by I expect that swing to PS4 to grow, while world-wide tie ratios for Xbox One to drop, as more gamers buy those exclusives on PC. Let's see what the numbers are by E3.

So did Far Cry only sell 318K in its first month? That's extremely bad.

2nd month. Overall it is at 681k.

and that does not even account digital sales ratios, wich should be a tad higher for xbox one, too

btw can you give some insight on the revenue vs unit sales split.
so when madden ps4 vs xb1 salesratio is 61:39, is the revenue split more in favour of the xbox one with 59:41 with more ultimate editions etc. sold?

that's the real interesting stuff, that tells you something about the different platform demographics

2 years on, North American Tie-Ratios - http://www.vgchartz.com/analysis/platform_totals/Tie-Ratio/NA/