I dont think they have the power to take bitcoin mainstream. Taking bitcoin mainstream would take a change in society, not a signle organization.
Widespread adoption is the key. Lots of people still think Bitcoin is for super techies or hackers.
Commericals showing the potential simplicity of Bitcoin transactions would help so yes people with lots of money could push
BTC more toward widespread use.
Yes, showing the advantages of Bitcoin could be the key to actually achieve an increasing adoption. But I think that we still need to make things simpler for regular people. Sure, there are already kind of easy wallets like Breadwallet, and so on, but a lot of people may still not see why they should use another currency, when they can use their respective FIAT currency to pay for things!