Kinda sucks for the players/customers to lose an option like Draftstreet (they are folding the site and just moving accounts over to Draftkings) but industry consolidation was inevitable. People had been predicting it for a little while now.
It is the #2 site buying out the #3 site if anyone was wondering. #1 is Fanduel
Also DraftKings is owned by Jason Robbins who founded VistaPrint so he has deep pockets and tons of VC connections. People are thinking DK might overtake FanDuel eventually and FanDuel is like the 800 pound gorilla. Riveting stuff, I know...