Just need another receiver with precuts or a prepro. The receiver or preprocessor( in most cases) decodes the surround formats. If your going for ATMOS you'll also need to consider different surround speakers. The Rotel amp and the M80's are the pieces you want to keep.
As for as the DLA-56 goes you've enjoyed it for 7 years ... technology moves on.
Since I'm working on my HT I've been looking at projectors and screens ... the projector I will most likely get is the LG HU810PW ... $3000 USD ... here's a link to projector central's review
https://www.projectorcentral.com/LG-CineBeam-HU810PW-Laser-Projector-Review.htm
