Translation of "Viable" in Japanese

Such ideas tend to become viable with technological advances

これは技術の進化と共に できるようになってきます

- Tom didn't think that his boss's plan was a viable one.
- Tom didn't think his boss's plan was a viable one.

トムには、上司の計画がうまくいくとは思えなかった。

What you're saying is perfectly viable, but I can't shake off my unease.

あなたのおっしゃることはもっともだけれど、何か割り切れないものがありますねえ。