The problem I'm having here is the sort of "meta" nature of the question.
Essentially, at least to me, it seems that the idea is that WotC should focus its attention on things that are popular. Seems like a pretty decent idea. Give the fans what they want. And, if no one wants something (or at least not enough people want something), they should focus their attention elsewhere. Again, it's pretty straightforward and I don't think anyone would really disagree with [MENTION=48965]Imaro[/MENTION] or [MENTION=37579]Jester David[/MENTION] on this point.
However, there's two problems here.
1. We actually don't know how popular different things are. We can speculate all day long, start polls, examine old polls, look at things like the old DDI, which actually did track this information, whatever, but, at the end of the day, that's all it is, speculation. [MENTION=48965]Imaro[/MENTION] might be 100% correct, and it's a tiny number of people who are disproportionately represented. Could be. I don't know and neither do you. I suspect that it might be mistaken and there is more demand that what he apparently thinks there is, but, at the end of the day, we're both just reading the entrails of a chicken.
Which brings me to problem number 2.
2. The argument is awfully convenient and the agenda here is pretty transparent. I mean, we've had two version of a Favored Soul already - a class that appeared in a 3.5 splatbook that, AFAIK, no one actually asked for in 5e. Have you seen any threads or comments saying, "Gee, I really wish 5e had a favored soul class"? I certainly haven't.
Yet, for all that, there's no complaint that WotC has spent significant time - twice in fact - producing a Favored Soul sub-class. I mean, if you seriously believed that WotC should be focusing on what is popular, then where are the threads and polls talking about how WotC is just wasting its time banging out something that no one actually wants? New Ranger? Well, fine, people are certainly asking for that and have been since 5e was released. Fair enough. But new Favored Soul? New Kensei? Really? That's what needed to be updated to 5e?
So, yeah, color me pretty skeptical of the agenda here. It's awfully convenient that the only class that sees this kind of argument - WotC shouldn't waste its time on something no one really wants - just happen to coincide with a class that [MENTION=48965]Imaro[/MENTION] doesn't like. I mean, come on here. It's not exactly hard to connect the dots is it?
I'd have a LOT more sympathy for this line of argument IF it were applied to things other than what people happen not to like. But, when "Well, we don't really need this because no one wants it" just magically coincides with "I don't like this", well, disingenuous is probably the most appropriate word.
*cue wide eyed look of hurt innocence in 5... 4... 3...*