fatowl now you mention the promise... I'm not impressed by it, explaining the old words was so much easier, I was working with some new rainbows teaching them about the promise the other week and one insists the only things she believes in are fairies and one direction 
Anyway, back to te point, OP yabu, If the beavers had my Rainbow waiting list to add to theirs even fewer boys would get places anyway. Many of the volunteers would not start doing cubs/beavers if Guiding stopped, after all if we wanted to be cub/beaver leaders we wouldn't have joined Guiding, they'd simply stop volunteering, so all you'd end up with is even more girls at Beavers and not enough leaders to start up any new colonies.
As for activities this term I've taken my girls to do high ropes, hiking, knot tying, football, a trip to the park and are having a campfire, very little in the way of girly activities because we haven't got a very girly group, the Beavers who meet in the same hall have done cooking, colouring, craft, games in the hall and a trip to build-a-bear.