Accent is a driver of the expectations we form about someone – we are less likely to trust someone with a foreign accent, for example (although whether the truth-values placed on speakers with “native accents” applies to all native speaker accents is not clear from the study). The study shows that we build different expectations around the accents of different speakers, though, so I feel it supports my point – part of the appeal of The Office is that we recognise it and the situations it portrays, British accenta in an American show would, arguably, limit its appeal.
I would suggest that the inverse – that American comedy doesn’t work so well in the UK – is also true, although this is less true wit non-comedy shows. Perhaps this is a result of the dominance of American media.