Economists are predicting that Bitcoin can reach that value in a year, tho' there are factors to consider, the acceptance and popularity and the bloom of usage of Bitcoin can increase drastically the price. The central banks who takes note of it's regulation is a good influence too. Well nothing is impossible but we must have point on this potential and work hard in this community. Good days are coming. Hang on.
I don't think any real economists are predicting that it'll happen. It's pretty stupid really - talking about multiplying the price by three in a year. Sure, it's happened before but those were in different circumstances, when the price was much lower and it didn't need so much of a boost to go that far.
As the now vanished iamnotback pointed out a while ago, it's about cumulative increase rather than just increase. Once we're at 3000, we'll be talking about 9000 because that would be multiplying by three again. To reach $500,000 by 2030 would require a cumulative increase of 59% per year - something which could easily be achieved this year with more, and then as Bitcoin comes anywhere near that amount it would slow down.
It's unlikely to ever reach that kind of level but my point is that it's very difficult for a cumulative increase to continue without genuine
investor confidence - especially since Bitcoin is no longer as convenient for small transactions as fiat.