Go to bournemouthairportspotters.com, they have a database of current based aircarft at BOH including the European fleet of stored 737 and new 737 corporate jets.
Comparison with BOH and other airports for May passengers:
BOH 67,953 -10.3%
NQY 20,381 -27.4%
EXT 72,583 -4.2%
CWL 135,890 -5.3%
SOU 157,887 -1.1%
BRS 534,654 2.9%
BRS seems to be doing well. The combined markets of SOU and BOH should be supporting pax numbers similar to BRS. That means there is still a big potential growth area for both SOU and BOH (150,000 pax per month each) currently leaking to the London airports.
SOU should be seeing 3m pax and BOH should be seeing 2.5m pax annually by now.