Sorry, but that's the only plausible and valuable argument in your post...
You can discard the two other reasons, really! 
well that's just the possible explanation to it, I really don't know if they actually mean anything or not (either wise I'll be filming H!M instead). Plus who knows... for example, the 10th year anniversary thing is in the future, we can't tell if they will actually film it (maybe they forgot) but it is a possible reason for the long lasting of H!M.
>>JTRIX
They've been filming H!M in advance since long ago to prevent schedule problems, and I'd believe the girls have no saying if they still want to do H!M or not. They have absolutely no reason to show two episodes of old scenes in a row. It might not say directly that they're ending this, but it's implied.
I understand that the H!M we watch every week is actually filmed earlier ago, but since this recap is going through scenes from 7 years of H!M, maybe they expect there will be so much from the viewers that it will take 2 episodes to do it.
Before they did recaps of previous episodes too, but those are mostly half of year to a year of H!M, so perhaps 7 years of recap = need 2 episodes to do it.
Furthermore, if flamingmoe is correct that they went to Hawaii, then there can be possible of them not having time to film 2 episodes and require the views to do this survey.
I REALLY DON'T KNOW...... but AGAIN these are just suggestions that I think it will not show H!M going to end. I don't want H!M to end because I like to see the girls on TV and doing things other than singing/dancing.
