It's pure fanboy delusion at it's finest, they seem to clinging on to the hope that Microsoft will still keep the Bethesda top titles coming to the Playstation, but keep all the smaller games nobody cares about exclusive to the Xbox, which as you say would make little to no sense at all, as you would have pretty much the same situation as now, and would be not out of pocket to the tune of $7.5 billion.
When the buyout was announced you got the usual reactions from the Sony fans, first it's worry that Doom etc will be an Xbox exclusive, then denial that Microsoft would not wan't to hurt the sales of these games by limiting them to one platform, which of course is not the case as they will be released on the P.C as well, and of course how could we miss out the old line Bethesda are rubbish and we never wanted their games in the first place, when reality finally sinks in.