I think based on the evidence we have right now, there's ample support for an impeachment, and that we should impeach, with criminal charges pending a full investigation.
...That said this is kind of a nothingburger. Or at least nothing we didn't already know. An aide passed on an e-mail trying to get Trump and Putin in contact, but we have no idea what their response was.
It's not really important next to the fact that multiple high level Trump aides actually met with a Russian operative explicitly about blackmail material on Clinton.