What Warcraft single player?
And MMORPGs are often played as SP game.
The audience for the next TES is going to be split in several passionate fractions, one being ESO fan base. That must be convinced to get into the next TES (which means by the way that one thing that is supposed to work one way [getting tes fans into eso] works the other way round.
I know there isn't a Warcraft SP coming. But if it would, what part of WoW would influence / evolve it? Apart from lore changes, I don't see any and that has no effect on the next TES, as ESO plays roughly 900 years before Skyrim and 700 years before Morrowind / Oblivion.
Sure MMOs are often played as SP. Still don't see this affecting the next TES game as MMOs work fundamentally different. What does an MMO cover, that could / should evolve or flow into a pure SP game?
If at all, it's a big "nope" to all wanting TES games to incorporate multiplayer in any form - they have ESO covering that.
Split audience - ESO first has to build it's fanbase. This isn't a given, not even with the success of TES / Skyrim. It has some things speaking for it and some against it, but how this works out remains to be seen. WoW didn't build mostly upon it's Warcraft fanbase, nor did SWtor build solely upon Jedi / Kotor games / fans.
Given the roughly 5 years interval Bethesda took so far between TES games, the next installment will be 2016/17 and a Fallout before that. That's a long time ESO can work / build up it's own fanbase.
…. and just because one has an active subscription with ESO, doesn't make him / her uninterested in a new TES.
PC 14%?
If I was Bethesda CEO I'd stop making new TES games on PC.
Why? Roughly 3 million copies isn't something I'd dismiss, especially not with the added longevity through modding.
... and luckily enough the current CEO seems to be a wee bit smarter than you.
I doubt that report because digital sales are hard to get data on.
Though I have no doubt the console version outsold the PC as that's old news at this point.
Source: Bethesda Game Studios, Steam, Zenimax - I don't know how they collected all data, but it's rather difficult to get better sources.