I agree. If things don't change, Republicans should concede this race and focus entirely on Nevada and maybe Maryland as possible pick-up opportunities. It's sad because Bennet is definitely very vulnerable.
Maryland? I think Republicans should focus on picking up NV, and defending PA, FL, and OH. Those are their four firewall seats for holding the Senate. If this was a midterm year, and Szeliga was running against Edwards, then maybe Maryland would be competitive, but I don't think so.
What we need to do (if we lose the presidential election, which is looking possible thanks to Donald the RINO) is maintain at least 53 seats in the Senate. That makes the path to 60 in 2018 very, very realistic (probably more likely than not).
Our path to 61 seats in 2018:
First, this year:
Jolly or DeSantis hold FL
Heck picks up NV
Portman and Toomey hold their seats
Johnson, Kirk, and Ayotte lose
This gives Republicans a 52-48 majority
Then, in 2018:
Racicot or Zinke pick up MT
Dalrymple (or another Republican) picks up ND
Wagner picks up MO
Ballard (or another Republican) picks up IN
Those are the four lowest hanging fruits. That puts us at 56-44. But it doesn't stop there!
We can also pick up these seats if we try, and get strong recruits:
OH, VA, PA, WI, FL. Picking up all 9 gives Republicans a 61-39 majority. Of course, I wouldn't bet on it, but it is definately doable.