Nonsense. Korean visitors are down because the Korean Won is the worst performing currency in Asia. Several years ago you could get 28 baht per thousand won. When I last checked yesterday it was 21 baht, per thousand Won... that's a pretty significant decline.
Yeah OK... thanks.
Anyway, the foreigners/tourists I spoke to didn't seem to mind riding electric bikes and it certainly felt safer than a regular motirbike.
10 or so years ago in Myanmar (Bagan or Mandaley, memory escapes) they would only rent electric bikes to tourists. It was a great way to get around and see the sites.