Because of this enormous growth in the early stages, people will be incentivized to buy coins that are still in the cents or 1 dollar range. Those coins have the possibility of achieving growth gains that are in the thousands of percentages. But right now, LTC is 20 dollars. I think its max market cap will be 500 dollars, because it doesn't give any real advantages over BTC and will thus remain a speculative instrument mostly. Those growth gains can be easily achievable with BTC, since I'm positive that we are in between the innovator phase and the early adopter phase.
It might still be worth a shot, because there are rumors that Mt. Gox will implement LTC, which will greatly increase its legitimacy. But it's up to merchants to adopt LTC besides BTC. As long as they don't do that, LTC's market cap will be limited and it's growth will only depend on speculative interest.
Right now, it might be worth looking for the next candidate after LTC, the one that has the best chance after LTC and that's still in the cents stage. If it can be ascertained for sure which is the best third coin, it would almost be a given that growth percentages of above 1000% and more will be achievable due to sheer speculative greed.
Speculative interest is all that is driving Bitcoin. Well that and Satoshi dice.
It's a feedback loop. Speculative interest is fueling merchant adoption, which in turn fuels speculative interest. But the fact that there's merchant adoption is significant. It's gone way beyond just speculative interest, though it does remain the main source of growth right now. Ironically enough, I don't think BTC or any other free market coin would have ever succeeded without speculative interest.
Would you care to venture a guess as to the daily Bitcoin transaction volume for goods and services?
I have no idea, though I've read reports that transactions do keep increasing, even though BTC is a deflationary currency. I should probably look into how they obtained those numbers.
And I keep reading every article out there. Bitpay and the like claim that transactions are increasing and I do see a news article pop up every day with merchants accepting. It looks like the growth really is genuine. IMO, the exchange rate will never permanently crash, unless the encryption has been hacked. Not even miners colluding will take it down.