Nah. Not just based on that. I expect Mitch McConnell will continue on the path it looks like he's on already, find some way of greasing the wheels of more moderate Republicans in the Senate and get the AHCA passed, one way or the other. Then, given the unpopularity of the bill even among Republicans, that will backfire huge in midterms, just like passing the ACA did for Dems. Nobody likes the AHCA. Absolutely nobody. Not one state views it more favorable than not.
So, if they pass it their gooses are cooked as organizations like the AARP hound the Republicans with ads about how they fucked over senior citizens, a large part of the base for those guys. And if Mitch somehow fails to pass it, that's just as terrible for them since it leaves them with no real accomplishments to talk of going into 2018 and instead makes them look like absolute failures to their base, who couldn't do the simple bare-minimum task of appealing Obamcare despite campaigning HUGE on it in 2016, having majorities in both houses, and having absolutely nothing to show for their efforts despite all their showboating. Nothing to brag about or argue to their base about why they should be re-elected. They'll be completely ineffective.
That's why I'm so confident. Not just the results of the races, but the AHCA is a poisoned chalice for them. Whether they pass it or not, either way will completely destroy them. Either their base will be hit with relentless ads from not only Democrats but also the AARP if they pass it, or they don't and their seen as failures, and not even their base is stupid enough to accept that that can be blamed on Democrats since even they know that doesn't pass the smell test, and why elect those guys again if they can't do the bare minimum? There's no winning play for them. One way or another, Obamacare will be their graves.
Getting power over every single branch in 2016 was the worst thing that could have happened to them and they were in no way prepared for it, which shows not only in terms of how Trump's government is still an absolute skeleton government with not so much as nominations for a ton of positions even now, but Republicans were caught with their pants down when they actually ended up winning and didn't have an actual coherent strategy for how they were going to repeal the ACA ready at first, and hemmed and hawed about what they were going to do at first instead of letting Trump have it as some fist 100 days victory.
And this is all without even considering other possibilities on top of the ACA/ACHA and the current polling situations/races. I mean, Trump has yet to face any type of true national disaster yet. Hurricane season just started. If any of the Gulf states get hit by a big one, who knows how Trump will react to that and with so many government agencies being understaffed, how well that will go over for him. Of course, that's something I hope doesn't happen for obvious reasons, but point being there's a lot of time left for Trump to do stuff like that and really hurt himself with even his base, just like Bush did with Katrina, on top of the poisoned chalice of the ACHA.
All that together is why I'm still optimistic about Democrats chances in 2018 despite Ossoff's loss, not just the tightening of a few races.