Wycombe
You're of course right that the large percentage increase comes from a low baseline. My point (although perhaps not worded well) was that I think seeing the route go from circa 500 pax in December '16 to over 3000 in December '17 is a good thing for the airport and gives an indication of what may be possible with competition on routes from SOU, particularly competition from established carriers with strong brands and reasonable fares. I'd expect an increase of similar magnitude in January.
I just hope easyJet are happy with the route and bring it back for next winter. I suspect that many potential customers would have already booked flights from BOH and the London airports by the time the SOU route was announced last July, so having the flights on sale earlier for next time should see stronger forward bookings. A Saturday flight would also be a big bonus if they introduce one. Whatever, it's just good that they're here for now!