cost to fully validate and store (for archiving) chain is constant growth. if chain become too big too quick, it will not be as decentralized as it should be, because cost to fully validate and store will be too expensive for average home user. look at what happens to ethereum, they must rely primarily to third parties for node. this is not a decentralized system in my view. bitcoin network thrive due to decentral aspect, capable by many who fully validate and run node