If bitcoin would sky rocket there would be much more investors and companies accepting bitcoins, even large companies like ebay.. So yes Bigger prices would effect ALOT bitcoin adoption.
If bitcoin's price was higher, then people could purchase big amounts of it without losing a lot in slippage. Right now buying let's say $1000 000 000 in bitcoins would really move the market, you would have to pay much more for the last bitcoin than for the first one. And that's not much money if it comes from many different people.