Yes, there is a slight risk as always. But it requires a lot to go wrong:
- liquidation attempt to somehow fail (this seems very rare)
- not getting paid back by the user (this is decently possible id guess)
- poloniex not making it right (Coinbase did make it right)
I'm closing out all my loans by the 29th. I don't expect there to be any problems, but hey, black swan events happen and as Taleb says, they shape history.
"liquidation attempt to somehow fail (this seems very rare)"
Under normal conditions I would agree with you, but Poloniex recently issued a statement on the hard fork, which said they they may or may not support bcc in the future. Which means that a lot of traders will be withdrawing their bankrolls from Poloniex to get bcc after the fork.
Imho, this is very dangerous for margin traders and lenders as there is less buy orders on the orderbooks of the major alts.