Not at all. Infernape's dual 120 BP special STAB, with excellent coverage and the ability to OHKO Blissey after a single turn of setup is something that is very difficult to stop outside of Infernape's frailty, and can never be usurped by Blaziken.
It can, actually. Blaziken just uses HJK.
I'd like to see a list of things that Infernape can reliably KO with the NP set that Blaziken can't, and I mean absolutely can't. Things like Jellicent that Blaze can KO with a decent coverage move don't count.
NPApe can still carry CC for Blissey and other special walls. Fire Blast and HP Ice gets pretty good coverage with CC I think.
What other special walls, per se? I can't particularly think of any at the moment - Jellicent is immune, Latias resists it (and is faster), Milotic will take more from GK, Ferrothorn is roasted by Fire Blast...I'd rather go for the KO on Vaporeon, but I guess both are equally viable. If I were to use Infernape in the first place.