They will never get 2/3 majority in the Senate to impeach.
The Senate doesn't impeach. The Senate convicts (or doesn't).
If the (D)'s win the House this fall, they will hold impeachment hearings. 100% guaranteed. They will be in control of all the committees.
With impeachment hearings their top priority, Trump and his MAGA effort will be brought to a halt save for what little he can do via executive order. Oh, and we can all forget about any possibility of getting some real answers and convictions re: the criminal activities the doj/fbi/dnc conducted in 2016. Gone. The D's will kill those investigations yesterday. The Senate doesn't have the guts now to do any real investigation, and will have less if the House falls to the D's.
Yeah, the 2018 mid-terms are a big deal.