It’s been around for a while - it’s just that it’s not getting a lot of traffic. I suspect the ones who’ve gone to Portugal are happy where they are, whereas others don’t really see themselves getting out from under the Indian thumb. I don’t know the first thing about the pre-invasion Goanese economy, but if it was anything like Macau’s, they’ve got a lot to be angry about. C’est la guerre.
If the Goans ever felt oppressed by India, the least they could do would be to launch an open independence movement, like those in Kashmir, who are even provided personal security by the Indian government.
Even border towns in India’s north-east have been able to do that.
Goa is/was nothing like Macau; neither did it have a Las Vegas-esque gambling economy, nor does it have a suitable harbour. It is probably among the more prosperous states, owing to the massive amounts of tourism that the state attracts.