You missed the point, easily seen from within your own argument.
Publicly traded companies do what is required to reduce costs and increase profits. Use Darkcoin, remove FX and banking charges. Profits up. Check.
Publicly traded companies are audited. They need to provide details of all transactions. Use Darkcoin. Compliance and governance complied with. Check.
Publicly traded companies need to keep records of their business dealings. Store records or payers and payees using invoices. Check.
And this adoption will take time. Every large company I've worked for has been held shakily together by a few underpaid IT staff wrestling with years of legacy in-house crap, and harassed secretaries.
Just one or two big names being on the ball though, and getting that ball rolling... we can hope.

Bitcoin 'going mainstream' will help definitely with public awareness and benefit DRK, we just need to keep pointing out DRK's advantages. Smart folk will pick it up, the rest will follow.