Nintendo 3DS will infact help out Sony, and other 3DTV manufacturers quite a lot.
In basic terms, the 3DS is an inferior 3D experience that will break into more casual consumers and leave them wanting the Real 3D experience.
Everyone's a winner.
And those who say that people will just wait for a 3DS over buying a 3DTV are nuts, or smoking something.
I'm sorry, but a 40 year old male (avg TV purchaser) does not say 'Ah, I'l just wait for a Ninteno games console with a tiny screen instead.'
Those currently* interested in going 3D will be home theatre enthusiasts. The DS does not represent a home theatre.
* Over time everyone will adopt 3D.