The Tariffs might help scope makers like Obsession and eyepiece makers like Televue, but the budget market is non existent right now and would need a long time to grow, during which people would be paying more tax for almost no benefit. Once a sector is dead or nearly so, it takes a long incubation to get it back up again.
Tariffs won't help Tele Vue, as their products are from Japan and Taiwan and there are import tariffs imposed on those countries too.
Nor help domestic telescope makers like Obsession or New Moon Telescopes when their products are 4-10x as much as imported telescopes of the same size.
In the case of eyepieces, a 4 element eyepiece made in the US is over $270, so the eyepiece manufacturing is NOT going to return to the US when 4 element eyepieces out of China are $30-$50.
Even with 500% tariffs, the Chinese products would be cheaper than a made-in-the-USA eyepiece.
Unfortunately, what I see right now is that tariffs have changed so many times that most importers have simply stopped importing until there is some stability in the tariffs.
No one wants to be the importer at 145% tariff when the following week it's 30%.
As a result, I'm seeing a huge number of "out of stock" messages on dealers' websites.
I fear retailers will have nothing to sell if this continues.
To the OP's questions:
Yes, prices will go up, and astute sellers on eBay and CN and Astromart will raise their prices accordingly.