It might have some effect on the btc price but not right after it opens up.
I believe it will take a while before this takes off.
Exactly my thoughts. OB is too small currently to have an effect, but hopefully it will grow via word of mouth over time and if it gets to a sizeable userbase then I could see it having an effect on the price, but probably not any time soon. I'm excited for it to be released though and will hopefully use it myself.