Really? How do you quantify this? Most people who are pro big blocks felt it went well (r/btc) and it'll take a while to make it profitable for miners to mine it. Many people who are against big blocks thought it'd immediately dive to $1, which is 1/200 of where it is currently at. It also seems like many pro-Blockstream people would dump Bitcoin Cash regardless, just because they don't believe in the rationale for it (r/bitcoin threads about how to sell Bitcoin Cash w/o analysis).
You could argue about market liquidity etc, but 4B market cap is hardly a failure. This doesn't mean it is a success. It is more accurate to call it undecided for the time being. To call it a failure is definitely premature and uncharitable, though.