All this talk about cancelling. You would lose pretty much all that you have paid if you cancel at this late stage. Most tour companies offer a rebate if you are unable to ski due to lack of snow (but it can be like getting blood out of a stone) so just go any enjoy whatever awaits you.
I defo think you should go. My friend and I were in Pamps this time last year and alot of the runs were closed. You could only ski down to the midstation, then you had to get the lift back to the top and ski down again.
The green run from the midstation down is still open and the temperatures appear to be getting lower. I would defo go, you will still have an amazing time. There are loads of things to go if you cannot ski in pamps.