tedster - 11:47 pm on Dec 29, 2011 (gmt 0)
Well, I doubt that +1 would ever become the only factor, or even the strongest factor. But I can see it being one of hundreds of factors.
This thread asks the question if the effects of +1 are to be geo-targeted. I haven't seen anything official about that, and no experimental testing either. So I'll hazard a guess that they will eventually become one of many geographic signals. But before that happens, I'm sure Google will make an attempt to normalize the +1 data in some way.