Funny, I see a lot of people having high expectations about bitcoin (I also have high expectations about bitcoin). but we cannot exaggerate. We have to think that in the future there may also be other competitors for bitcoin. We also have to think that in the future people can do the unthinkable: be more interested in altcoin than bitcoin. So we are comfortable thinking that in the future only bitcoin will attract people's attention so that the price will be 1 satoshi = $1 may be a mistake
Actually price for bitcoins should reach above $100,000,000 in order for us to see satoshi at $1 as we all know satoshi is one hundred millionth of bitcoin. Expecting such huge price for bitcoins might not be that good because it might take years or maybe even decades to reach that price. This huge pump might also make a lot of altcoins achieve great heights and altcoins posses more properties than bitcoins to be used as a medium for payments.
There are some altcoins which are originated as a mean of payment similar to XRP and they might take the throne from bitcoins in the coming future if ever prices for each of the cryptocurrencies are sky rocketing.