What Would Make People Gain Much More Interest in Bitcoin?

- Full acceptance by PayPal?  Would be a start, but remember this will likely only be downward pressure on BTC unless Paypal where holding a significant portion of BTC payments in BTC.
- Interest from Apple?  Couldn't hurt.
- Centralised, safe exchange?  If universally accepted there would be no need for exchanges.  A centralized exchange for an open-source distributed ledger is quite possibly the worst possible scenario. 

What do you think bitcoin needs for the major interest worldwide?  More legitimate people (i.e. not trying to scam anybody) spreading the word and educating people about the pro's and con's of bitcoin.