No Bitcoin was the first and almost the other coins can just be traded by BTC so the demand of BTC will always be higher then an altcoin.
you wish
It depends on wich coin is held by people. If people don't hold bitcoin and just use it as a gateway to alts (which they hold) there doesn't need to be increase in btc price at all.
I hold alts and fiat. I do only hold btc for very short time to move between exchanges as i lost hope and trust in it. Practically speaking: i trade alts directly for fiat. Btc is just in the way.
But don;t you think acceptability of btc is more than any other altcoin if very few merchant accept one of altcoin, then what it can buy for you? However that cannot be said for btc, but some innovative coins will for sure seize the opportunity, I appreciate the technology behind crypto currency and by far the most innovative thing that happened in the field of financial market but we need to put this innovation to some use.
Having said that some coins like ZiftrCoin and likes surely have some edge as they promise you e-commerce with it and I think a step in right direction to give crypto currency mass acceptance. Don';t you think ?