the number that would actually use it regularly or even continue to use after its initial release is quite low
That's just not true.
The whole pvp community would use it for as long as this game lasts.
Now, I would love to see a spectator mode, and I do hope that we will see one - sooner rather than later - however, realistically, what Nakatoir is writing here is absolutely true.
Why is it we are so hungry after a spectator mode in PvP?
Because we want to see WoW as an e-Sport, and have a community outside of just battle.net.
We want to be able to host tournaments and have leaderboards to be topped, and titles to be won, just like we have in the StarCraft community.
- Now, how many SC2 players actually use the spectator (observer) mode for custom games? A very small part of the playerbase, I tell you. Even fewer - vastly fewer, in fact - participate in tournaments, which are the main "conusmers" of the observer option.
The spectator mode actually impacts the "outside world" much more than it does the "inside world", as we watch all of these tournaments on streams, not in the game itself.
So, back to your statement. Yes, the "whole" PvP community would use it for as long as the game lasts (whole might be a strong word, here, however).
But the thing is, that they wouldn't be using it actively in-game, if you get my drift..!?
The in-game feature, "spectator mode", would only be used by a tiny fraction of (even the more hardcore than casual) playerbase.
The rest of the WoW PvP Enthusiasts (whether they play themselves or not), will be enjoying this feature passively through streams and VoDs.