It's all well and good to say brewers should just try different varieties, but it's not that simple. A small brewer here uses Perle for bittering in their German styles, and the boxes coming in are suddenly half the alpha acids as previously. Now their contract won't supply nearly enough hops. And before you say it doesn't matter what variety is used for bittering, their test batches having tried a selection of likely candidates for replacement have all been noticeably inferior. I would not have believed it if I hadn't tasted the beers myself.
I'm all for trying lots of different hop varieties. I think I have 15 different ones in my freezer right now. But for a commercial brewer they have to sell a consistent product. You can't just up and change your favor profile and not upset the market. Most of the people drinking their beer are not homebrewers, and expect the same taste each time. The brewers are now spending a fair amount of time on the phone trying to line up additional supplies.