Internet is always slow in India even if the cables were not cut. So we wouldn't know the difference. Most people would think that its just another Indian isp internet problem day. Here if internet is down it will take time to fix it. So even it was out for a week or so most people would still think it was some problem with their isp.
No one would even consider thinking that may be the internet backbone has some problem. That's because the internet we get in India is always slow and riddled with choppy connections.
All this news have done is given the isp's an excuse to tell customers for a few months.