Hardly. The RP fills a much-needed slot at the low end. The future of the R is a little less certain, although Canon may keep it in the lineup to meet the current price point or at some point they may introduce an RII to slot between the R6 and R5, where there is a huge price gap. Still, I doubt that either of these cameras are R series. More likely Rebels.
I'm trying to think...has there normally been a slot between the 5 and 6 series? I can't recall one off the top of my head. Its been 5D down to 6D, or before that down to 7D, then the XXD series below that. At least I think.
We don't know what canon is planning yet, but we've got R5, R6, to replace 5D/6D, and R and RP filling in legacy spots in the XXD series and arguably Rebel series (based on price point, one could argue that R is like the XXD series and RP is filling the higher end rebel price point and functionality).
We'll see what happens, but I like the idea of more new stuff to choose from.
-Brian