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I suspect we'll see the market for reusable straws increase in Taiwan.

I have no numbers but I suspect that's already happening. I saw several people carry these reusable cups for drinks around last year (it seemed almost like a fad, but I hope it lasts):

https://www.rakuten.com.tw/search/冰霸杯/

Buying a reusable straw seems like the obvious next step.

Many shops also give a 3% or so discount to people who bring their own cup.

Water isn't acidic, and is much better for your health than literally any other liquid.

Unlikely; in over 40 years I have zero cavities.

That's why they make metal straws which also works for hot drinks like preventing Coffee from staining your teeth.