I agree that it should be investigated, but I just think it's highly unlikely that anything like that happened in such an explicit manner. More likely would be that Trump people saw Putin acting against Clinton, and decided to egg them on....giving Russia more things that they would want, in order for them to continue, without ever cutting an explicit deal. That's pretty much how campaign finance corruption happens. You do things that your donors want, and they keep giving you money, without either of you having to actually articulate the corrupt bargain that you're engaging in (because that would get you in trouble).
That's a really good point.
I would still state my wish for the most thorough investigation reasonably possible would be for, if anything sinister was going on, or any situations like you described, to come out in the open and even if it wouldn't be enough to remove him from power, to give voters more information when they go to the polls in 2020. So long as we can get the facts of what really has gone on with all of this out, either Congress or the voters can make informed decisions.