M805's, or N805's? Neither are my favorite speaker (I've owned both), but you & lots of other people love them.
Anyway, I routinely watch movies & even general TV thru 2 channel audio systems hooked up to both of my TV's. Very satisfying, depending on the speakers, amps, etc. of course. I'm using little Spendor S3/5 SE's in my "bedroom system" right now, for TV, movies, & music, & they are terrific.
Anyway, I say, keep the 805's & even the Rotel amp, & use them with your new TV. It can also be a "dual purpose" music listening/movie watching system that way, with a CDP, or tuner, etc.