Well, I must agree with the sentiments of HZ123. SEN will not bring the passengers in unless the airport provides decent facilities. It has to be a completely new facility rather than the current situation of a toilet with an outside terminal.
40 pax, yes but only on a busy day. SEN future seems to lie with its Engineering side and perhaps storage, but even then they are running out of concrete.
Having read the forum, HZ123 may seem pessimistic but probably accurate.