Here's the thing - every communication has an intended/expected audience, right? His current audience are people who are interested in 5e, right?
Well, yes and no.

If all he's doing is talking to those interested in 5Ed, he's not doing his job of selling the game. He's just preaching to the metaphorical choir. From a marketing perspective, he is (or should be) addressing gamers who may be on the fence about the new edition (like me), and even bringing new (casual or even non-) players into the hobby via his particular gateway.
Preaching to the choir just reinforces the message. Its important, but not crucial. Ditto the casual and non-gamers- they are where you can grow your business, but they won't necessarily keep you afloat.
The fence sitters, though, are who can make or break your game. Even if they number less than the "choir", their satisfaction- or more accurately their lack of it-will be a huge factor in the word of mouth PR battle for sales.
To use my current group as an example, they were just as curious about 4Ed as they were about previous editions. However, the more they heard, the less they liked. By the time I bought it and brought it to the table, 4Ed faced a HUGE challenge in winning any of them over.
Whereas with prior editions, all of the group had the core rulebooks and some had a few of their most used expansion books, 4Ed only got one DDI subscription and me buying only he most player-centric books (IOW, stuff with classes & powers).
As of right now, most of the group seems to have tuned out the 5Ed chatter. I personally follow it somewhat, and remain unconvinced either way. It isn't discussed, except in the sense of "When is it coming out?" ...and that, mostly from the ones who disliked 4Ed the most.
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