If we get to where I think it will, I think we'll see 2 coins, 1 for investment and 1 as a "daily" coin, being much less worth in value (aka BTC and LTC), whether or not it's those 2 coins or not though is a different story.
Any "just for investment" coin will have nothing for its value to base on and therefore WILL be a bubble.
BTC doesnt suffer a problem of needing silver to accompany its gold as it were (ie a lower value coin to go along side it) as it goes right down to a tiny fraction of a penny anyway, the Satoshi (smallest amount of bitcoin) is worth an absolutely tiny amount, so even if bitcoins go to a billion dollars a coin the satoshi is still daily useable, and they have every amount in between covered too.