I'm not 100% certain but I believe the gap was always planned as seem odd otherwise that all flights would cease.
I know the airport has been very proactive in marketing the last 12 months so have faith that they know what their doing.
What has to be taken into consideration that it was only a month ago that Flybe announced their departure on these routes. Within 2.5 weeks it was announced that CityJet will step in to take over these services.
The fact that it has been the festive period hasn't helped either.
Can't see why a more business friendly Glasgow schedule will not work well compared to what is being offered at present. According to the CAA stats this route has seen an increase in passengers compared to last year every month since April.