Gyan wrote:It is a parallel process, and both will go on simultaneously. By 2025, a 6 ton satellite being launched would be equivalent to 20 ton satellite of today due to Ion Engines & Miniterization of electronics.
You are ignoring the demand side of things. It is like semiconductor . The number of transistors on a chip has increased multifold, giving massive boost in processing power and memory. But still , given the computing demand, it really hasn't reduced demand for computing because demand is not static and the number of devices in the market has gone exponentially higher.
Same with bandwidth and transponder capacity. The extra payload capacity with larger sizes and ion engines and miniaturisation will be eaten up in no time. There will be myriad new applications and demands that will come with falling prices and greater availability. Today both are tightly "command and controlled" items in India.
Why the bulk of satellite TV in India is via foreign owned satellites. Even getting them off into Indian transponders (we are capacity constrained at this point, you can't get them on demand here in India) will result in big latent demand getting fulfilled. Cut prices and increase capacity , demand will go through the roof.
ISRO DOES need large satellites going upto 10 tons. The GSAT that MKIII launched seems to be technologically on par with the best there is out there with high throughput and spot beam with multiple polarisations etc. It is easier to and cheaper to do all this on a single large satellite than a cluster of co-located ones (even just two will be an issue). Stuff like station keeping and synchronisation of signals and precision alignment between even two of them , if they are looking at high through put stuff , will be a huge science problem and too complex.
Far easier to build larger rockets to carry heavier payloads to space.