It will be available on Litecoin. The masses will be transacting on Litecoin or some other off chain derivative of Bitcoin or even fiat system ecurrency such as SEPA. Bitcoin's protocol will not be modified.
What's this SEPA stands for? First time I come upon it.
Anyway, I hope bitcoin will someday be worth enough for me to buy some Mercedes/BMW suv.
SEPA stands for Single Euro Payments Area. For countries that honor SEPA and are included in it, it allows them to easily transfer money including bitcoin. I think the problem it solves is the otherwise difficult time one would have because of country borders and transfer costs.
In regards to John Nash creating Bitcoin I think I could just as well say someone else created it. I dont think we will ever know for sure.