Sorry, I've found the exact opposite. Everything involving equities is more complicated. Things we do naturally in futures like taking shorts are not as straight-forward with equities. There's borrowing costs, dividends for starters. Secondly margin is not nearly as beneficial with equities (unless you're prop) as compared to futures contracts (which don't involve any borrowing costs either).
If you're in a drawdown right now the right solution is not to abandon ship and throw everything out the window - it's to take a step back and be patient. Identify what you know how to do and recognize it's not working right now and that doesn't mean it won't always work. WRT to 500k/year, that's a matter of account size and the risk you're willing to take and you know that. I highly doubt liquidity is the issue.
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With the trading we were doing on the trade ideas thread, I realized my best trades were in the back months where liquidity in fact is an issue. The more liquid the spread gets, the more trading becomes 50-50 and the edge diminishes.
Don't worry about abandoning ship yet. It's just that ags are completely dead right now so I am looking for alternatives in case it continues...