There is no link between coinbase's listing on Nasdaq and Bitcoin's long-term prediction.
Yep, that was my first thought. It's all well and good that Coinbase decided to go public, but they're one exchange out of many, and history has shown that bitcoin's price doesn't react much to whatever's happening with any given exchange--hacks, scams, you name it, bitcoin's behavior is independent of any of that.
And as far as 30 year predictions go, you can make them if you want but I'm sure as hell not going to believe any of them. People can barely predict what bitcoin is going to do within a week's time frame, much less 30 years. If I'm honest, I'm not entirely convinced that bitcoin will even have a 10th of its current value in 30 years. It might not even exist (though I'm guessing it will) that far down the road.