Others forum threads on this as well. Besides the proliferation of brands (many of which are the same bikes being privately branded by small importers), I think the industry has other challenges / changes occurring. Channels from the manufacturer to retailer are changing dramatically which results in less POs being signed at trade shows like Interbike.
I went to Interbike this year for the first time. I enjoyed the show and established some good contacts in the industry because I want to have an ebike / emoped business but I don't want to just private brand Chinese models produced for private branding. I think there are 100s of small mom-n-pop business already doing this and there is simply no way that is a good long term strategy (can only compete on price and chasing the bottom is always a bad strategy - not even good for consumers that end up with products they will never find parts or service for in the future).