Dont think of it as Big Blocks and Small Blocks - think of it as 'adequate' and 'inadequate' block size.

Today people might think 32GB RAM is a lot for a computer - but maybe in 20 years you will need at least 1TB RAM to run the 37 AIs that help run your life.

Bitcoin is supposed to be currency for the world. If blocks are not enough to handle the demand, its 'inadequate'.