Discard earlier part of blockchain to save space?

It seems like discussions about increasing the block size are related to concerns about the blockchain getting too big, so that individuals can no longer run their own node. My question is why can't the community just agree to discard, for example, all blocks earlier than 800,000 and just move forward with a smaller blockchain? I know that each new node is supposed to verify all transactions going back to the genesis block, but that has already been done thousands of times, and we all agree that all those transactions are valid. It seems like starting with block 800,000 and the known set of UTXO's at that point, is just as secure as going back to genesis, and it would allow the scalability discussions to include the possibility of larger block sizes as a solution, without disadvantaging smaller users by creating a hugh blockchain. What am I missing?



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