Why this bitcoin Global currency because it can be used in the world that adopts it, BTC will be Global money, AMIN.
You know there are so many other threads to increase your post count on right?
On topic now imagine 100M people living in 3 different cities in 3 countries, in theory there could be at least 500 purchases every second=500 transactions/s and 500*60=3000 TX/minute and 180,000 TX/hour, or 30,000 TX every 10 minutes/every block.
Right now every block only contains 3000 TX max that would mean we'd need ten times bigger blocks and we can't just ask merchants to bite it and wait it out for transactions to be confirmed.
Though I'm just considering the large transactions starting from $100 up to any amount as those 30,000 and even each one of them paying $1-$2 as fees.
We won't see any of that until SW/LN are in play.