The Prestwick numbers are very similar to the Leeds numbers in the early days of that route. Hopefully they will pick up a bit because I don't think that June figure will be quite good enough to sustain the route. However, from my own personal experience of using it, the numbers on board seem a lot higher this month than they were in June. There was about 150 on board (inbound) when I used it at the weekend.
If it survives for next summer it is likely to move to Glasgow International which would probably boost the numbers a bit.