The "push" to Google+ is more trying to correct the mistakes of the past where for N products that had a sharing feature, there were at least N ways of sharing things. That's just broken, confusing and cumbersome for users. G+ the platform is just the sharing layer for all Google products. G+ the stream is almost a separate thing that uses G+ the platform for sharing posts.
So now it's supposed to be ~1 way of sharing for all products. Latitude was location sharing, therefore the sharing should be integrated with G+. Normally doing the sharing via G+ wouldn't completely obsolete a product, but if _all_ a product does is share, it's ripe to be a feature of G+ rather than it's own product. That's what happened here.
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The "push" to Google+ is more trying to correct the mistakes of the past where for N products that had a sharing feature, there were at least N ways of sharing things. That's just broken, confusing and cumbersome for users. G+ the platform is just the sharing layer for all Google products. G+ the stream is almost a separate thing that uses G+ the platform for sharing posts.
So now it's supposed to be ~1 way of sharing for all products. Latitude was location sharing, therefore the sharing should be integrated with G+. Normally doing the sharing via G+ wouldn't completely obsolete a product, but if _all_ a product does is share, it's ripe to be a feature of G+ rather than it's own product. That's what happened here.