Say 1 BTC is $20,000 and 0.001 is $20. Sending $5 or even $100 may not be practical, but a low fee 3rd-party wallet for day-to-day spending is just fine. The real value will be in your "savings" aka your cold storage.
If you modify BTC into an alt-coin it will be susceptible to more bugs, more issues, more security risks, etc...
Bitcoin will gain MORE value over time if people leave it as-is, because the antique-ness of it will be sought-after.
Owning the First Crypto will bring nostalgia, where-as anytime you change an original it loses value.
Wrong analogy. If Bitcoin is a digital currency, then everybody should be able to use it.
All Americans still use dollars, don't they.
That is one reason why Bitcoin is infinitesimally divisible.