First I want to say bitcoin can not be stopped and will never go away. Thats said everybody says it is a huge problem with a backlog of about 200k transactions.
What would happen at 300k, 500k?
A significant difficulty jump is projected to happen in 4 days.
We'll get to 300k backlog very quickly, end of next week at the latest.
500k looks probable too in only 2 weeks.
There is no shortage of coins today to transact. Bitcoin is a crypto reserve and settlement currency. If you need to buy something with Bitcoin, contact these merchants and convince them to accept other currencies.