Even today (I mean right here, right now) with all the problems Bitcoin has (and there is plenty - such as it doesn't scale well) it's already superior to gold so I don't see a reason why it shouldn't be on par with gold.

We cannot/do not want to get to $500,000 per BTC any time soon.  Here is the math behind it:

https://bitcointalk.org/index.php?topic=694401.0

If BTC were to go to $500,000 in this era it would cause a catastrophic mining bubble:

   $500,000 x 25 = $12,500,000 per block = $75,000,000 per hour

   $75 million per hour would drive the mining to attempt to use 675 GW.  This is about 30% of all the power generated on the planet.

So, in order to keep our power consumption under about 2% of world wide power production, we cannot/do not want the price to get to $500,000 before era 6, which is about 2033 or so.