Even if it was time to go all in, which I'd disagree with as we just started with this new core, I don't think our needs are great enough to trade a first.
Our only large hole right now is 3C. You could argue 3LW too, but we have Miro and Leonard coming up. I'd be weary spending a first on either of those positions, but I am easily seduced by Stanley Cup dreams.
I love ROR as a player and would be super excited to get him. But I can't help think we'd be falling into the same trap the Kings did with Dubois. Neither Dubois or ROR are 3Cs, It might not be a good fit.
Perhaps if we got someone like ROR the "4th line" would have to be an actual 4th line.