Yeah it's hard to see Bioware getting shut down... but I really doubt they've been living up to EA's expectations recently. Trying to look up the numbers, seems EA has been a bit coy with these sales figures, but using vgchartz.com they list Inquisition with 4.93M and Andromeda at 1.88M. Then there's The Old Republic MMO which they must have sunk a ton into, yet only listed with 2.97M sales and went free-to-play a long time ago.
So that could be 3 of your 4-5 "awful sales". And it really must be rubbing salt in the wounds how badly they're getting their asses kicked by the competition like Bethesda and CD Projekt. When EA bought Bioware they were a marquee brand, and EA probably had designs on making them one of their heavy hitters like Madden or Battlefield.
Except under their leadership, between Dragon Age 2, the Mass Effect 3 fiasco, and turning the Old Repbulic into an MMO, all that goodwill has been flushed away and now Bioware is more of an afterthought. I'd imagine these games being Origin exclusive doesn't help either, since as they age they're not being seen by exclusive Steam users waiting for big sales to pick older games up.