How about the legal implications.
Legally, there may not be much here. According to the only one talking about the meeting itself (namely, Donald Jr), it turned out that the whole meeting was to talk about the Magnitsky Act.
I doubt that "intent to received hacked emails" rises to the same level of prosecutability as "conspiracy to murder", but I may be wrong.
More evidence may come to alight about what actually took place in the meeting itself that may lead to an indictment, but right now I'm thinking this is going to be a legal "nothing burger".
Far more important, of course, is the moral and ethical implications of going into this meeting. Imagine the Republicans' reaction if it was the Democrats that were meeting with a foreign representative (not that anyone can accuse US conservatives of moral consistency).
And this may end up being relevant to other parts of the Russia investigations going on now.
But I may be wrong; I don't spend my entire day glued to news sources, so it would be easy for relevant information to slip by me.
Patriotism is the excuse that countries give to themselves for their failures. — Stephen Marche