Minimal boost is better than nothing, I don't think MS had much choice, I think Sony forced MS' hand with this new gen.
If I recall correctly there was a lot of articles suggesting Sony wouldn't be releasing the PS4 until 2015, Sony even went out of their way in 2011 to state that the PS3 would be around for a while longer.
http://www.maximumpc.com/article/news/will_sony_really_wait_until_2015_release_playstation_4_console
http://techland.time.com/2012/09/26/what-if-sonys-next-playstation-didnt-arrive-until-2015/
Now this is nothing NEW for Sony, they have always supported their consoles well into the next generations life-time, but, bear with me, is it possible Sony wanted confusion as to when the PS4 was releasing to put MS at ease and think they had more time than they actually had?
Everything since the Xbox One's reveal makes it seem as though MS was in a bit of a clusterf**k, and making it up as they went along.
I don't think MS had any idea just how far ahead Sony's R&D was, and then had to take a completely reactionary stance.
Rushing to make deals that were not as profitable or cost efficient as Sony's.
Locking down manufacturers, some exclusive 3rd party IPs, etc.