I can tell you this isn't an unrealistic scenario.
https://bitcointalksearch.org/topic/would-you-play-on-an-ipoker-skin-using-bitcoin-as-a-deposit-method-61892
A $250k buy in MTGOX moves the market massively. Full Tilt Poker, (ponzi scam that it was), owes players $300million. There is a massive gap to bridge before bitcoins can actually be used for such large commerce. I do agree with your premise however, I just don't see it coming soon. The upside is that the price certainly needs to be much higher to be useful for large scale monetary operations.
It doesn't matter. As soon as someone wants to gamble with or pay out in bitcoins, they will have to buy them first. It is simply impossible for bitcoin commerce to exceed bitcoin demand (and hence the market value of all bitcoins). The gap you refer to is not an obstacle for anyone who wishes to make use of bitcoins. The only real question is whether or not people decide to use them.
Besides, if one of the big poker sites announced they were using bitcoins, we'd see an instant rise in price due to speculation. Come to think of it that might be an interesting way to make some money if you are a poker site. Buy a bunch of coins and then announce that your site is going to use them
It would also be a rather foolproof way if you are Amazon or Ebay. I wonder who will be the first to do it.
We need Bitcoin Poker Chips.
Might want to hold on to that 500 BTC Chip....