According to a recent interview with a Bethesda member, it looks like there is currently no possibility for a landing of The Elder Scrolls Online on Nintendo Switch.
During Gamescom 2019, the Editor of the Twinfinite portal had the opportunity to talk to Matt Firor, Game Director of the title. During the chat, the interviewer asked if there were opportunities to see The Elder Scrolls Online on the Kyoto House’s hybrid console in the future. The answer, unfortunately, was negative. In fact, Firor highlighted the technical difficulties a similar project would face, stating: ” It won’t happen. The only way it could work is if there was some kind of streaming service on Switch. It’s simply not powerful enough” There does not seem to be any hopes for a title transfer on the Nintendo console.