On it’s current timeline, player count is merely a measure of marketing success, not game success.
Also, your ignoring the fact NFS had other viable competition around it at the time such as GT4, FM1, Juiced, and succeeded because the game was actually superior, nothing to do with it’s positioning. FH5 will obviously attract large numbers as it’s the only worthwhile simcade racer currently available. It’s success is coming from a business sense, not a “great game” sense. People by their own nature won’t dig deep enough into a title to figure out “is it actually better?” or rather is it an insult to the series itself? They just look at the pre-release hype, get sucked into the convenience of downloading it and just measly cope even if the game is dull as anything. Sort of like a mass hysteria.
PG and T10 push the content because they have to since they changed to a live service design in FH4, not because they care.