It can be a console manufacturers fault for 3rd party to fail, but it's gonna be some very specific circumstances producing that result. Such as...
...a game just not working on the console (not enough buttons leading to odd workarounds, raw power isn't up to snuff, etc)
...1st party dropping a megahit too close to a 3rd party title
...maybe some weird restriction kills interest in the game (online is stupid bad for an online-focused title, maybe overabundance of enforced censorship, some other system-specific BS like '1080p or bust' is forced on a title, etc.)
...or the online store for the console make it hard to find content outside the chosen big titles (or hard to find content period).
As far as promotion of games go, I think it'd behoove any console manufacturer to have an active social media presence highlighting each release of the week. Maybe a stable of YouTube series, each devoted to a style of game (retro, arcade, RPG, competitive online, etc.) starring enthusiasts of that particular corner of gaming.







