in terms of purchase and sales bit coin holder's are safe but the lack of proper monitoring system by implementing different protocols client are demotivated for using this currency on investment projects.Every country's government should established a policy for securing those client who are holder of bitcoin like an cash or deposit account holders and this types of policy help to motivated bitcoin holders for investing different sector for establishing new entrepreneur in order to development of economical condition.
I think you need to define safe before continuing answering this question. I think that bitcoin will be "safe" at some point in the sense it will stop having -10%, +10% days so that you can actually put a huge amount down
and gain or lose a little. However I think it will take at least 5 years to get to this point so it wont be for some time before bitcoin is deemed safe.