Instead you might cash it out at several times greater than the present price in a few years. It would be easy to drip 10k BTC into the market and liquidate several hundred thousand coins over the next year.
Really ? You could put 10k BTC on sell side per day and the market wouldn't collapse in a week or two ? From what I can see on this exchange : https://www.bitstamp.net/market/tradeview/
You could push it below 2k$ with less than 10k BTC, I'm assuming there are bigger exchanges - I'm not following BTC close - is there an aggregate of exchange bids on big exchanges ?
Also, it might be very hard to move large amounts anonymously onto an exchange, and if you did that (even assuming they couldn't trace the BTC to your nefarious origin, or they are clean), I'm sure you are violating some market manipulation law somewhere.
If you demonstrated you could do this once - why would it ever recover ? Who would invest in it again ? Especially with so many altcoins.