Q.Raspberry Canes Die
The raspberry canes from last year will die after early stages of fruit development. The new canes will not develope in time to produce fruit.

Certified GKH Gardening Expert
Unfortunately, raspberries are susceptible to many diseases that are not curable, and lifelong. This is probably the case here. You can choose to keep the plant around for an ornamental, but it is likely that you will have to find a more disease resistant cultivar, or plant blackberries instead.
Here is an article that will help:
https://www.gardeningknowhow.com/edible/fruits/raspberry/raspberry-canes-turning-brown.htm