This is the price graph for the past week.
You can see that the initial pumping up did not end up in dumping as the support base is getting ever wider, or rather the dumping effect was neutralised by the growing user base.
I have been personally approached by many businesses to set up Bitcoin transaction services so I can testify to the above.
The bottomline has gone from below $200 to $300 within a mere 2 months.
Could it go up further? Definitely.
Is it a good time to go in? Depends.
If you are using it commercially, yes.
If you are speculating, maybe not, if you are patient enough.