I'm quite certain the story will change & evolve. However, I'm rather sceptical that the writing quality will.
Part of why I gave it up so early is purely on me: I am a sucker for a page-turner -- once a plot picks up a certain amount of steam, I have a near-compulsion to finish. This is the case even if, upon reflection, I don't like the writing, characters, events, etc...
Nothing less fun than coming out of a reading binge at 3am on a work night reading a book you didn't like!
edit: Random sampling in future chapters reveals great heapings of soliloquy and dialectic. I don't feel too bad about setting it down.
Oh this has happened to me far far too many times...
If it helps, MoR's plot is fairly episodic and doesn't start to pick up steam until about chapter 16
I'd add an "I loved it" but honestly, I liked a lot of the things you disliked, so YMWPV.
However, there are plenty of others (standard IMO disclaimer applies). ;)
(As a very quick & somewhat quantitative example, look at how many words the author spent on the contrasting views & strained relationship of Ma Potter & Pa Potter WRT magic in the first chapter, vs. the approximately zero words spent on that same topic in the second chapter when magic is demonstrated directly for them.)