That's a huge upwardo movement and frankly speaking Bitcoin can't be able to get to such height soon, especially this year to next year. Bitcoin hasn't the bubbles right now for the shooting as many speculators had said but with time bitcoin will surprise the entire globe again. According to news today, bitcoin is now recognized as a form of money by the US government which will help the said Bitcoin grow faster.
I keep saying it, but this is because it feels like no one really understands what this means - a currency is only a reflection of the value that it is able to and which it does actually purchase. Let's say I move to an island and I start a village. I bring 2500 men and 2500 women and each man and woman makes approximately $10,000 of goods of which half of that they sell to each other. I make money so the men and women don't have to actually trade their apples for oranges and cow's milk for veal etc, but instead can use a medium of exchange. Assume that I do it as a one-time thing, and don't bother increasing units, and that I base my currency units on the amount of Year 1 trade undertaken - so $25 million of trade ($5000 per capital x 5000 people, half of which is men and half of which is women); thus, 25,000,000 Island Coins.
Now, at the start of Year 2 everyone has approximately 5,000 Island Coins worth a dollar each, but by the end of Year 2, everyone roughly tripled production per capita, and around a quarter of my islanders managed to save. Furthermore, everyone actually managed to fulfil 80% of their production quotas in Year 2 with sales! This is what this looks like:
Actualized Production: $75,000,000 (80% of which resulted in transacted value in the form of coins thus:)
($60,000,000 Island Domestic Product Sales) / (25,000,000 Island Coins) = $2.40 per Island Coin
+ 5,000,000 Island Coins Saved (25%) = $3 per Island Coin
This is a very very basic guide - but still a very very valid guide - to how currency values are formed (all the best answers are simple). But my point is, unit value against USD is irrelevant in terms of what you imagine is appropriate if you are not doing these calculations first. If I had issued only 25,000 Island Coins originally, each Island Coin would now be worth $3,000 - it is here nor there what the price per coin is. Simply, the coin reaches the value of goods produced (interpret that here to mean made and sold) divided by the issued units plus any trade surplus capital (interpret that to mean saving).
Now, we must first therefore understand WHAT BTC is purchasing in the next 12-18 months that it is not already purchasing today. Plus, do we have less supply? Plus, what's the cost of production of the currency and the anticipated savings rate? All these questions point towards the answers I have given earlier in this thread as OP.
It doesn't matter whether $250k seems like a lot of money to you. That is irrelevant. BTC's unit value is a very specific calculation based only on the stuff above that I have been explaining throughout this thread
If the banks are able to custody the asset as was announced and as you correctly point out here, then a 5% share of global currency value gross is hardly over-ambitious. That's around $250,000 / BTC.