Well, with no reason to use them instead of regular fiat, and real risk of government intervention making them worthless, and a continuing supply coming on the market daily, I would guess under 10 cents. That worth comes from the very small chance this will take off. A low probability, huge payoff bet.
Imho of course, and I could be dead wrong. So diversify. I personally would start watching charts for a buy point under 1.00, just to see if it sets up. I might buy some around 10 cents regardless of charts.
You have to be kidding yourself if you think the price will drop to 10 cents. Anyone who sold a decent amount between $10-30 would happily buy thousands of coins at $1 or $2. If I sold 1000 coins at $25 and prices fell to $1, I would want to buy those 1000 coins back, plus more and still have a large profit. Especially considering there is nothing wrong with bitcoin, it just hasn't taken off as fast or in the way some have envisioned.
Obviously a guess, but anyone who made a good amount of money in the double digit range would have to be an idiot not to invest some, say 1/10th, back in once they think it has hit a low point. The chance to gain that income twofold would outweigh the risk of losing a small amount of your income at those low costs. That alone would keep us above the very low digits.