Any proof as to the demand being worthwhile enough for WotC and their new publishing strategy?
Note: As of this post the poll is showing less than 25% of 5e fans want WotC to create a warlord...
Nope.
This forum skews heavily to former 4e fans after the closure of the WotC forums and age of the site. Which is normally awesome, as there's a good legacy of cool posters here. Lots of history and knowledgeable folk. New people are starting to come and shift the demographics, but so far this site skews older than Reddit or Facebook. But, currently, if anywhere is going to get a lot of warlord love, it's here. Warlord discussion pops up on Reddit and Facebook occasionally, but never with as much traction.
And it's only getting 25%.
As I described elsewhere, WotC had access to the results of surveys from 175,000 D&D fans, which the 2000 people posting and lurking here in a good day would be 1% of. If a lot of people there cried for warlords, they would have considered it. After all, they completely changed their mind on the Mage class after feedback.
They also have the data from the Online Character Builder. They can see what classes and options were actually played at tables - through which characters were levelled slowly over time - rather than test builds. So they have an idea of the popularity of all the classes. If the warlord was really popular there, it might have also led to it being considered.
Looking at the DMsGuild offerings, there are 9 warlords I can see. Three copper sellers, one silver, and and 4 medal-less. Copper is around 50 sales, silver is 100, and electrum is 250. Give or take. So if we assume each is halfway to the next medal that's (25x4 + 75x3 + 175). Or 500. Which is gold.
The
combined sales of every warlord option on the DMs Guild compares to the sales of the
spellbinder class or the
eidolist. And is half that of the
shaman.
The warlord has a few ardent fans. But it's not so fantastically popular that WotC is likely to take a
fourth crack at filling the role.