Honestly I would be totally happy with just being to get 1gbit symmetric NAT/L3 FW performance, and accept the tradeoff that the speeds are the currently quoted MX67/68 speeds if I turn on IDS, AMP, or use site to site VPN. It's understandable why the latter features require significant computational power in order to reliably push 1gbit, but 1gbit NAT is something easily achievable on the ARM chips that are used for the MX67/68 -- in fact, there are plenty of pro-sumer products that can do this.
At-home use cases for 1gbit are almost always about download speeds. It is the difference between a Windows 10 installer downloading in 2 minutes or 5 minutes. Or a Xbox video game title downloading in 10 minutes vs 20 minutes. That's something that consumers appreciate, especially when in a lot of places, fiber to the premise gigabit is being offered at a lower monthly price than 100-200mbit cable internet.