This is a horrible hire, but they really didn't have a choice at this point. Martz was the only one desperate enough to go to Chi this year.
Jerry Angelo and Lovie escaped outright firing this year likely because of financial reasons. The Bears would have had to pay them anyway over the next two years and with a potential lockout looming, they didnt want to pay two coaches for nothing. Many suspect that Lovie kept his job because of an accountant's perspective.
With Angelo and Lovie as dead men walking if they dont return to the playoffs, any assistants brought on would not have much security beyond this year, so most candidates did not express interest. Martz is obviously an old friend of Lovie's and has received no other offers, so it was the natural choice on both sides.
The next move will be finding the D-coordinator and that will likely default to the promotion of Rod Marinelli ... anothe Lovie buddy. Building leadership around Detroit Lion castoffs has never been a recipe for success. I'm curious what role they have in mind for Matt Millen.
As for Martz, he will need to be able to adjust his game plan and style to fit the current Bears roster. Long dropbacks with a bad oline is not wise and abandoning the run for the pass with Cutler is even worse. They could possibly hit the mark and improve the O, but it doesnt appear to be the case based on history. Martz will need to change his spots and tailor the game plan to the talent (or lack thereof) on the team.
No matter who the coach, they need at least two new olineman to upgrade a poor line that is getting worse.