I thought the new "collector focused" line mostly ended the backgrounders anyway.
(Or it just seems that way because there's no "new" backgrounders, just redos at the moment.)
Yeah, when they started making ROTS concept Anakin and Ki Adi-Mundi (a good figure, but an odd choice), you know they were running short of Prequel Hero types. Those figures (and the more praised McQuarries/Johnston) arguably took away new tooling that could've been applied to actual movie characters. In that regard, the realistic Clone Wars figures are going to as well. Which is all reasonable, because a lot of the backgrounders we want have been slow movers compared to those concept figures and Hasbro has to balance things out.
But I hope they wouldn't "replace" concept figures, because I wouldn't mind a concept Gammorean Guard, maybe a few others.