Obviously at the weekend when Sky News show some sporting action that is not on SSN some people may tune to Sky News but many people turn to SSN for big breaking sports stories, not Sky News, because they cover it in more depth. This move should allow for more focus on news at the Sky News Centre, leaving the sport to SSN.
That would be all well and good if Sky Sports News covered sports news. It doesn't. It covers football news very well, but ignores practically anything going on elsewhere unless Sky have the rights. For example in terms of rugby union coverage, it gives some coverage to the Heineken Cup and Guinness Premiership (AFTER its covered the football for a good chunk of the hour) but bearly mentions the Six Nations and completly ignores the Magners League.
During the last Olympics, the biggest sporting event in the world, Sky Sports News barely mentioned them while continuing to devote its time to football coverage.
Don't get me wrong, what Sky Sports News does it does very well. Gillette Soccer Saturday is extermely entertaining (and informative), but it means that for six hours, on the busiest sporting day of the week, Sky Sports News doesn't even pretend to cover any other sports - they are simply ignored. Now Soccer Saturday's remit is to cover soccer, but to exclude all other sports from a sports news channel for six hours is, to excuse the pun, just not cricket.
If this is to work, the Sky Sports News team will have to realise that (a) there are sports other than football and (b) they need to become more than just a promotional outlet for the other Sky Sports channels.