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It's just Sunweb these days, was Giant-Alpecin for a while but Giant and Shimano have basically been slowly pulling out off the team, which is no bad thing, as the latter work with Lotto NL Jumbo closely now, and Sunweb have committed long term.
In terms of licenses they want to get it down to 16 by 2020 (i'm fairly sure that's the number, and it's currently 18. At a guess, Cannondale will eventually be unable to fund themselves and then maybe Dimension Data? It's become clear that the latter really lack strength in depth.
http://www.cyclingnews.com/news/dimension-data-to-ride-bmc-bikes-from-2019/
So team BMC is going to be CCC, BMC as a sponsor are moving over to Dimension Data, which are at risk of being relegated from World Tour ranking and Cervelo are going to sponsor Giant Sunweb (which I thought was basically a Giant factory team). This is getting confusing already.