You have to look at it as a huge positive cutting Canada loose right now, at least it finally provides an indication that Tomlin and/or Rooney weren’t happy or satisfied with the offense’s performance.
But practically speaking, yeah can’t expect many significant changes the rest of this year. You want to really get uninspired, go read the article on PSN summarizing Faulkner and Sullivan’s prior resumes. Faulkner followed Canada around to not 1 but 3 if his prior stops. Offensive rankings of Sullivan’s prior OC stints pretty low.
Bottom line, nice change now to somewhat re-energize the troops ( players and fans) but the real measuring stick for future fortunes is who they bring in to be the permanent OC position after the season’s over.