You are right. But even with NaCl, the original question remained: would a game dev compile an NaCl app for Linux (even though code changes weren't required.)
PNaCl eliminates a dev's actions to recompile.
PNaCl eliminates a dev's actions to recompile.
PNaCl removes the need to compile different x86 vs. ARM binaries for NaCl.
A more significant difference is, however, that NaCl is restricted to the Chrome web store, while PNaCl is available on the open web. You can have a PNaCl module your web app, on your website/domain today, and Chrome 31 (and later) will run it.