I think it is obvious that:
a) without new technologies we will need 24 GB blocks. ( 10 billion transactions per/day )
a) without new technologies we will need 24 GB blocks. ( 10 billion transactions per/day )
Agreed.
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b) current technology cannot handle 24 GB blocks (and will not handle any time soon)
The block size would grow slowly making this point largely irrelevant. Assuming we experience near the maximum amount of growth permitted by BIP101 (Gavin's proposal), the max block size wouldn't even be 1 GB until until the year 2030.
Current technology only needs to handle 8 MB blocks.
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c) with SC and LN bitcoin can stay decentralized and handle billions of TPS using small blocks (maybe bigger than 1MB be we are far from reaching limits of 1 MB blocks)
SC and LN may be necessary with BIP101 anyways. For example, we won't be able to support 1 billion TXs per day till 2037. So SC and LN would be needed anyways should demand for TXs grow faster than what BIP101 allows.