Nothing wrong with options. Some live and love just 2ch. Some love. 5.1, etc... It would be sad if no new tech hit home theater, . Figure out what YOU want, get it and leave it for what ever time frame keeps you happy. For some Atmos will be night and day, for others hardly noticed, if at all. No rule states any theater must have it "all" to be enjoyed.
My current setup has been running strong for about 5 years with 7ch and I knew (well, speculated ) Atmos was coming. My previous setup lasted me 13 years, I got Dolby Digital (Denon AVR5600) in 1996 when most folks had still never heard of it. I am speaking primary about AVR/SSP and speaker placement, so obviously I have done some here and there with video, etc, but nothing that required changes to the room. For Atmos, I am going to strip down and start again, and my next setup should keep me happy for many years as well.