ABC doesn't look like it's getting bigger blocks anytime soon. Also the REASON for bigger blocks is very important. SV wants millions/day more txns on chain as soon as possible.
Codebase is the same. Limit is 500x over the demand. Certainly enough until next year. About millions tx/day, from where, who do you think is so eager to use the blockchain?
Remember that you're using the future uncensorable twitter? There's a few tens of millions+ of txns/day more. Need I go on? How do you expect miners to pay their bills with no volume?
Fincen companies need secure ledgers, right now that mission critical infrastructure is very expensive to maintain. SV can do it 2 orders of magnitude cheaper.
My buddy works for a medical robot company that wants to use a blockchain for secure diagnostic sharing globally, the fastest/cheapest way will of course be op_return txns on SV.
There's a guy here in Tokyo who is putting all land registries on the planet into the blockchain and using a searchable database that's quicker and easier than any government's.