Worth remembering that the Area contests have all crept forwards a good few weeks in the last 10 years or so (I can remember playing at Colston Hall on the first weekend of April, for instance) which may have had an impact on those bands who can't risk putting their test pieces together on fewer rehearsals.
Worth noting that 4BR today reports that the Ripon Entertainment contest (aimed, I think, at lower section bands) already has a full book of entries. Admittedly it's not during such a busy time of year, contest-wise - but certainly shows that this kind of contest remains popular across the board.