Given we know 5Ghz can give us like 600Mbps real world on 80Mhz channels, would a fixed line in India typically be above that speed? Is it all GPON these days or still DSL/WISP type stuff?
I'm aware, but, um, without sounding insensitive, not for $50 per sub in hardware cost. Tarana is about 10X that. If you have that kind of money labour is cheap enough to run fibre for the same amount.
The only way that starts to make any sense is if you're doing 128way-256way gpon splits which is not something most are willing to do if they need to make any kind of profit and sell anything more than 100Mbps packages. I wasn't even willing to do 64w splits over 10 years ago now and in hindsight that was wise.
You could go active but then your SFP/SFP+ per port cost eats you up.
For less than 1mil fixed wireless is going to cover 2,800km/sq. You are not going to to get anywhere near that cost trying to do the same thing to 2048(or more) subs in that footprint with fiber. That wouldn't even cover your fiber material cost!