do you think that without eso, the gap between V and VI would be less than 10-15 years?
Different teams. Its like saying if Red Dead 1 never happened, that GTAV would have released in 2010 when both games are done by 2 different teams. So what ever the reason they are still working on The Elder Scrolls VI, ESO existing doesn't mean if it was gone, they'd make VI as they are a online MMO team.... I see on evidence that ESO was made so the team wouldn't make Elder Scrolls VI as it makes very little sense. They likely wanted better assets, wanted fresher ideas and wanted to focus on Fallout IP more until they had something better for Elder Scrolls VI