Thesis turmoils

I've been trying to come up with a suitably interesting and specific thesis topic, but am having a really hard time. I had a seminar today where I was supposed to present my topic so we could all discuss it, but I did a really terrible job and thus got little feedback. I'm just having a lot of trouble focusing it.... Anyway, here goes:
This term I focused much of my research for the design workshop in housing forms and their performance in the block, so I thought I would continue this as a line of research. In particular, I'm interested in the ways in which we deal with the transition between the private spaces of the home to the public space of the street. This change is marked in some way, indicating the difference in spaces, uses, ownership, etc., through vertical and horizontal planes: walls or fences as vertical, different levels as horizontal.
Recent trends in urbanism towards opening up the interior of the block for public activity, (though of a different character than voids that consist of blocks on their own), have led to additional tactics to differentiate residential private spaces. When they're moved to the upper floors of a building, what happens to the ground floor? Sometimes we convert this into commercial or office space. How does this then affect the fabric as a whole? Are we going to get a fabric that is just entirely commercial space on the street level?
Ok, if we're experiencing a return to the center, a return and rejuvenation of urban center housing, combined with the opening of the block, we'd need to consider ways of reconciling these. But we already have many ways of doing this!

Ok, fine, but what's the problem? where's the problematic? I have none right now.
My first attempt at pinning this down somewhere was to try to look at housing in regeneration, then in its role in urbanized innovation environments, neither of which I was clear enough about to make any sense. So....
I dunno, but I'm tired.