Putting a TV between two speakers does affect the soundstage. However, I have found that by moving the TV forward/backward in small increments, I found a location that minimizes the damage.
Room Acoustics
I pushed my 34" widescreen TV back more towards the front wall yesterday, getting it out of the way of the 2 speakers thinking of improving the sound. The soundstage did expand, but the imaging was less defined. Does putting a television between a pair of speakers actually improve their imaging? Are their any advantages as to put a big object between the 2 speakers?