I'd like to be wrong, but that kicker didn't just have a bad day. He had an atrocious day. He had the worst day of all time in Texans history for a kicker. And he hasn't ever proven that he "can" be consistent like Brown had at least in the past before he withered.
I think Bullock will get to stick around until he
at least causes a lost game (probably more likely 2 or 3). I'm willing to give him slack like Kubiak is doing, as I wouldn't be comfortable on cutting him on the limited evidence that we have available. He's obviously done enough to have the job in practice, and he did deal with the pressure of a game winning field goal in week 1, and (as should most NFL kickers) has made 85-90% of his kickoffs touchbacks.
Kubiak has stood by struggling kickers before, and I don't have a huge problem with that. I think it is a hard position to change mid-season (perhaps the most difficult). Even trying out other kickers could prove to unsettle the incumbent even more, due to the sporadic, mentally demanding, high pressure nature of a kicker's game involvement. Unfortunately as a kicker a streak of missed field goals will see you out of a job at the pro level pretty quickly.
The final thing to consider is, does Kubiak want to cut another highly touted special teams player, and risk another Trindon Holliday embarrassment? Every time be bring back a return, the announcers mention for the country to listen how the Texans didn't stand behind their guy after a few weeks of the season, and how the Broncos have benefited. There is ever chance that Bullock comes out of his rookie jitter session - and due to the draft pick and time that the Texans have obviously invested in Bullock, I don't think that he'll be getting any knee-jerk release papers.
Potentially comforting fact of the day: Sebastian Janikowski missed 3 of his first 4 NFL field goal attempts, and in his entire rookie year was only asked to make 4 50+ yarders, making only 1 of them.