(P)NaCl was introduced to replace NPAPI, at a time when the majority of rich web interaction still happened through plugins.
I'm glad to see it killed off, and have been expecting it for a few years now. JS/asm and (hopefully soon) WebAssembly have supplanted many of its features and benefits.
Still, this doesn't strike me as anti-open web. Google offered a solution when one was needed - it didn't gain traction, so they eventually retired it.
Google introduced PNaCl and made it available as a feature any Web page could use, knowing that there was effectively zero chance it would ever become a cross-browser Web standard. That was anti-open-Web.
I'm glad to see it killed off, and have been expecting it for a few years now. JS/asm and (hopefully soon) WebAssembly have supplanted many of its features and benefits.
Still, this doesn't strike me as anti-open web. Google offered a solution when one was needed - it didn't gain traction, so they eventually retired it.