Doubt anyone will operate into Vagar other than Atlantic Airways any time soon.
While there is a tourism market, it's fairly small in comparison to other places and there isn't the numbers that airlines like Easyjet require. I was in the Faroes last month and flew there on Atlantic on their 2 x weekly LGW service, there was only 26 pax on the outbound and 50 odd on the return (numbers were helped by football).
Faroes aren't massively expensive to get to from the UK direct in the summer from LGW or via CPH on SAS/FLI