I hate to say this, but there were Nagler-like eyepieces (large 80 degree plus FOV eyepieces with complex high performance designs) around before Tele Vue. They were exceptionally expensive and produced in low numbers, but they were there.
Probably for specialized applications, like submarine periscopes and the like. So, the hobby would have adapted products meant to be used for another application, much like the Night Vision technology today.
What Tele Vue did was take the idea of UWA eyepieces and make it an astronomy-specific product.
Amateur astronomy is an incredibly small niche, and (as a group) we are notoriously cheap. I doubt one of the big optical companies with small astronomy units (Nikon, Pentax, Zeiss for example) would have risked capital to make a hobbyist-targeted product. That would be left to an inspired optical expert to form his own company.
However, I think the premise of the thread that without Tele Vue we would still be using Erfle performance level eyepieces for wide field viewing is a bit of a stretch. For example, Pentax developed their eyepieces for their telescopes, a business that pre-dates Tele Vue. They would have done it quite independent of Tele Vue.
Someone had mentioned Asimov's Foundation trilogy earlier. I think that is appropriate in that in time someone would have came along to fill that role of "inspired optical expert forming his own company".
And who is to say if such a person might have developed earlier or better designs than the way things unfolded?
All speculation. I would have to say things turned out pretty well as is.