Glacial advancement and retreat is just a mass balance problem, if more mass is added to the glacier than sublimates or melts, they advance, otherwise, they retreat. In a warmer environment it is possible that winter deposition may increase allowing the glaciers to advance, however, my glaciologist coworkers see no sign of this happening at the moment.
As to the shutdown of the gulf stream... a geologist friend of mine was looking at a partial shutdown of the bifurcated Icelandic portion of the stream in the past. The effect was sudden, but not global in scope. Locally it was bad. In terms of total energy transfer of the gulf stream, It may have negative impacts on western Europe, but it is not likely to change Canadian or Russian conditions much since they don't benefit from it much right now. The ocean currents are not the only poleward energy conduit.
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