Lets first have a steady price around 1000$ or € that would be a nice milestone.
But I read so many different things 10k, 100k 1m per bitcoin it's all a possibility.
I think a 100k target could be achieved in the future, that's my prediction.
in 1 year: price around 5000 USD
in 2 years: price around 25000 USD
in 5 years: maybe between 50000-100000 USD
100000 USD would make bitcoin a "large currency":
http://www.coinometrics.com/bitcoin/mix