Compare the games your average high-end smartphone can run to the AAA titles of the 2010's. It's not a matter of "unless it is able to" but "when it is able to".
Extrapolating from your gaming example, it will take smartphones only... *checks clipboard* ...100 years to achieve datacenter-level performance at the pace of 2010's improvements.
Your argument is true if the number of parameters in an LLM is the only measurement for quality - a bit like number of bolts per aircraft or lines of code in software. I'd bet you that an 8b parameter LLM will in 5 years outperform the datacenter-level LLMs of today.