If it goes to a single daily flight it will of course be next to useless for business travellers. The time when I flew with EIR to JFK via Dublin there were a large number of business travellers on the flight, some of whom were apparently very regular passengers. I believe Flybe have stated that they see LCY as the business airport, and as Expressflight says it is puzzling that they should choose to open the route at the same time as launching from LCY.