This is 27x the current market cap so if the current price is $16704 a good target is $451,008. Prices above that would seem excessive to me.
I shared some of my reasoning here: https://news.ycombinator.com/item?id=15840591
You are not going to get 1000x higher prices than the current price, my opinion. It's not justified. On the other hand, 3x, 5x and so forth prices are easily justified given what bitcoin "is" and the role it can serve. This remains so even if transaction prices are very high, the blockchain is very slow, and there are more liquid and easier alternatives. This is because bitcoin serves as a kind of "gold" for various usages of that term. The only difference is that when you hold a piece of gold in your safe, there is no physical possibility that due to a coding error in the fabric of the universe, it disappears from your safe.
However there is a very large possibility of bitcoins disappearing entirely, due to a coding error. It is very important to hedge against this or account for this possibility.