My questions are as follows
(1) Who are those responsible for minting of this stable coin and is the process and amount of minting being regulated ?
Bitfinex for one, with their Tether.
(2) Can they be trusted of not using the minted coin to influenced the price of other cryptocurrencies ?
Trust is subjective, however, Bitfinex/Tether have been accused in the past and they have a on-going case.
https://coingeek.com/tether-bitfinex-sued-for-creating-the-largest-bubble-in-history/So I don't know how you can trust such companies.
(3) If this minting continue, what do you posit for the future of the stablecoins and those that are holding them ?
It's supposedly a stable coin, meaning 1:1 USD, they could remain in cryptosphere as most exchanges are using them. It's just the question of how exchanges are using them, it is for their own advantage or for traders?