It has taken Comcast longer than most to finally welcome YouTube to its set tops, but this week’s announcement to offer the Google-owned video streaming service on the Xfinity X1 set top is just the tip of the iceberg. It represents the next step of the operator’s ambitions to build a home where various sources of content can live harmoniously – from where the US cable operator could launch massively disruptive TV offerings. Comcast’s Chairman and CEO Brian Roberts described this strategy as becoming “the aggregator of aggregators.” Speaking at the Morgan Stanley Technology Media & Telecom Conference this week, he hinted that Comcast won’t stop at the plunges it made in 2016 towards embracing OTT video, namely its integrations…