As long as there is fiat money, people will always first spend it since it is inflationary, so the scenario that bitcoin used for daily spending at large scale will never realize
Then the major usage left are long term saving and international remittance, both happens at very large size (over $100) and very low frequency (once a week/month)
In fact, majority of the transactions today in bitcoin network are pools paying miners and speculators deposit/withdraw from exchanges/gambling sites.
Gambling sites could occupy large amount of transaction capacity for blockchain, how to move their large amount of traffic offline is a challenge, maybe they should cooperate with bitcoin exchanges and do internal settlement without direct receiving coins from individual users
And what case do you make about decentralized app that will rely on the blockchain? i.e. OpenBazaar and Joystream?
Crippling the blockchain would just cripple what you can build on top of it.
IMO, decentralized trading platform has been promoted for some years but never gained enough traction. This is largely due to the fact that no one want to send the money/goods first, and there are many complex scam/theft schemes in payments, which makes the dispute impossible without the involvement of authorities, but when you have authorities that can rely on, you don't really need decentralized trading anymore