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Right and society only works on one thing at a time

Yes, why working on something that "may" be beneficial in the far future? This is like inventing a 128-bit CPU architecture. Nobody would be able to utilize like even 1% of that, even with AI.

I'm not sure what performance improvements you're expecting with cell phone generations but most of it's pretty incremental. I don't think 7G is going to be even twice as fast as 5G on the same frequencies. It should be more stable, maybe millimeter wave will get deployed more, but it won't be wasted at all, lots of towers are going to be running at 100% utilization.

Research on 5G started ~2012 to be deployed since 2019 (7 years), research on 4G started maybe around 2000 for rollout in 2009 (9 years later). For 6G, research started around 2018 for an expected rollout around 2030 (12 years). These timelines are pretty typical in the telecom field.

The paper lists the "earliest plausible" deployment of 7G as 2039-40, so only 1-2 years off your estimate...

It may not be needed, but it will certainly be rolled out.