While there are definitely Japanese influences in American culture, I don't see that as a "Japanification", certainly not to the extent that was feared in the 80s (cyberpunk had megacorporations, etc).
One of the reasons for the endurance of English-speaking cultures (in particular) is the ability for both the language and the culture (which are distinct yet related) to absorb other languages and cultures.
Take as a counterexample France. There is a Ministry dedicated to keeping the French language "pure". There is plenty of lip service paid to the preservation of French culture. Basically France is acting like its language and culture is under siege... because it is. There are many examples like this.
English as a language seems to have no issue with absorbing the concepts and words of other languages. Once that have been here for centuries have long since been anglicized but more recent adoptees often preserve the original pronunciation.
So what you see as Japanification I see as English-speaking culturue and language simply absorbing another language and culture. This changes the language and culture but both remain firmly "English".
One could even characterize this as "cultural hegemony". It's not really any different to Romanization that took place 1500-2500 years ago.
I would even argue that as much as you might think of this as Japanification that Japan is probably becoming more American/English than we have become Japanese. Japan is still obviously a very different place to the US but many things have changed. There is less of the "job for life" thing that was very popular only decades ago, just as one example.