I think of Atmos and the other object oriented codecs sort of like 3D. I am not jumping to revamp my system to accommodate something that right now doesn't have a lot of source support. However, if I were going to buy a new processor I would future proof it as much as possible. Whatever you choose make sure it has HDCP 2.2 and HDMI 2.0 so that you are really as future proof as possible right now. HDR video may be the next must have thing and it needs both.
_________________________
Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner