having an overflow blockchain makes sense when there are high fees tho
then we can have a 3rd when that one gets full.
everybody can decide if they want to pay for Bitcoin1 security or have cheap Bitcoin3 payments
both of these ideas were tried with bch and bsv and the users made their choice
who knows we did go from 1mb to 4mb for segwit, maybe it happens again in 10 years, who knows