1. Weakening is good. Collapsing is not. Why invest today if you can wait for 6 months and get 300 or wait for a year and get 350 or 400 .... Also, foreign investors can't repatriate their profits since there is no foreign currency available.
2 & 3, Yes
4. Doubtful since most businesses that depend on imported inputs are closing down. If this continues, they will be out of business as they can't spend on fixed costs like rent/lease indefinitely.
Economic collapse/depression is not good for anybody. Just see Lebanon, Somalia, Ethiopia, Sudan, Haiti etc. Or even Afghanistan next door.,