Dendrobium blooming..not many leaves left.

[Tetra73]

I have a newbie question about my dendrobium frosty dawn, a hybrid, not the pure nobile type. It is currently blooming very nicely and the main cane has about 15 flowers when it finishes blooming. When I got it about 6 months ago, it didn't have a lot of leaves. It was still growing new leaves on the newer cane. However, it was losing leaves too from bacteria rots. Eventually, all of the older leaves were gone, except the newer ones. I haven't lost them yet while the flowers are in bloom right now. BTW, this dendrobium I got it has never bloomed before because all of the older canes are very short and small, less than 10" tall. The newer cane is about 2ft tall though. Only the top 6" has those eyes spacing and there's where the blooms are coming from. The rest of the lower portion is completely covered in its brown sheath.

Is it going to be a point that even most of the new leaves would drop by the time it finishes blooming??? Also, when should I expect another new cane to grow soon?