Hey, I was thinking about his idea:

Why cant blockchain regulary split?

Not fork. Split. Meaning all the blocks before the split will be forgotten / archived. Index of all accounts will be preserved, thats no problem because index is small compared to blockchain.

Right now BTC blockchain has terabytes and we are FAR from mass adoption. Wheres the limit of size that will become extremely hard to handle?

Maybe (probably) my thinking is flawed, but still....do you know?