Changing Houses

[rgbmcl]

No: HPFGUIDX 93198

I'm not sure where I read this - it was definately in a JKR interview 
I just don't remember which one - but it was mentioned that someone 
would be changing houses in the next couple books.  This brings up a 
lot of interesting possibilites.  My personal favorite:  Harry to 
Slytherin.  There's been this theme of the persecution of Harry 
running through all the books, and this would continue it nicely.  
Also, we've all been looking for the character who's supposed to 
unite the school, bringing Slytherin into the fold as it were.  Who 
better than Harry?  The main problem I have with this theory, though, 
is that I can't really see any plausible reason for the shift of 
Harry to Slytherin.  I mean, we all know the sorting hat said he'd do 
well there, but I really can't think that he, personally, wants to go 
there.  Nor can I think of any external agent that would force him 
there.  At the same time, I can't really imagine anyone else changing 
houses either; unless it's a slytherin into gryfinndor (where our 
attention is focused).  Hermione going to Ravenclaw, or Neville to 
Hufflepuff, is, plot-wise, fairly insignificant and doesnt't suggest 
any dramatic character development.  I don't believe that this is 
only a minor plot point.  As Dumbledore said - its the choices we 
make .... i.e. the changes we encounter...  I think this ability to 
change, to reconstitute oneself, will end up playing a major role in 
the plot of the series.  Give me your solutions to this riddle, I'm 
still a bit dissatisfied with mine.