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I'm not sure if VM and Sky would ever be allowed to join up, but if Comcast fail in their bid to grab Murdoch's companies, they'll be looking for others to buy. Comcast are desperate for international exposure, so, perhaps they might make a bid for VM in the future.
And, as the AT&T/Time Warner merger has now completed, with AT&T renaming Time Warner to WarnerMedia, who's to say that AT&T might not join the bidding party now??