13 years is a lot of time. Almost double as much BTC exist. Price can be any high. You also need to understand that you will be able to buy way less with $500k as you can now. Somewhere from half less to way more less. So when you measure BTC value for so long you should use something else then $. Maybe Gold or Bread. But in general such long predictions are useless. Rather predict price at year 2020 or if you are brave at year 2025.
To my point of view, it's obviously yes.No one can stop the bitcoin growth.It's keep on increasing year to year.If all the country accept the bitcoin means.In 2030,surely the price of bitcoin is greater then 500 k $.In Poland also ,now bitcoin is accepted in Hotels.Likewise All the country accept bitcoin mean,their is no doubt of this to be happen.