If a BTC is $100K almost nobody will be trading in Bitcoins.
If transactions less than $1000 are considered spam and require a minimum $50 transaction fee, then yeah, almost nobody will be trading in Bitcoins.
This is the best part, due to no central agency controlling this currency, I can still send you one Satoshi, without paying any fee, it just takes a couple of days to get confirmed, depending on the amount of miners.
Whenever there is any decision made on bitcoin, more then 50% agrees. Due to this, only decisions that will profit everyone will be accepted. For this reason they also put advised txn fee in percentages rather than in fixed numbers. (ok a lot of Wallets still allow input per numbers) And at the same time, you can still send transactions without fee, they just take longer to get integrated into blocks. Knowing how the internet works, and how people on the internet work... I never see a majority of people voting against banning free payments to your own friends. (even if due to that the payment takes a bit longer)
Keep in mind, that at some point, the miners need to be fully paid from txn fees, so we will need a lot of txns, all giving a tiny bit, to be able to support the miners. (to keep bitcoin safe)
(that 0.02 is txn cost 
) 
