1k GB per year is a bigger problem than the 1MB vs 20MB thing imho or at the very least equivalent...
This is misinformation and you are confusing people.
That number isn't true as it assumes we will immediately be processing 84k transactions per block which isn't going to happen.
20GB is the future limit and not the size of most blocks in the future. We are only 600-700tpb at the moment
https://blockchain.info/charts/n-transactions-per-block which means we are typically 15-25% full blocks for 1MB blocks.... do you really expect this to shoot up to 100% full 20MB blocks overnight?.... it will take years to start getting close to those levels.
Additionally, you are completely ignoring the work that is being completed on merkle tree pruning.
This needs repeating again, and again, because many here are thinking that we will have 20MB blocks added to blockchain the very moment the block limit is raised. Calm down. Average block size is now 0.35MB,