We can absolutely DEPEND on congressional Republicans to clamor for (and receive) multiple high-profile, in-depth House and Senate investigations. They'll make as much political hay over this failure as they possibly can.
And Obama won't be given over a YEAR to clean up all evidence of failure like the Bush administration was given after 9/11 (by many of these same Rethugs).
Nor will Obama be allowed to dictate exactly which of his family bagmen will be most useful in directing the investigation, like BushCo was.
Nor will he be allowed to decide what 'theories' are 'off the table', like BushCo was.
IOW, in THIS case, with 3 dead, unlike what we saw with 9/11, with over 3000 dead and (and Billion$ in property damage), Congress will absolutely get down to EXACTLY where the failure lies.
And you can be certain that in the end, it will be determined to have been ... surprise, surprise ... All Obama's Fault.
Their solution will no doubt be do everything they can to destabilize his Presidency, so that he has to focus more on defending himself than actually protecting the Country. And then when something ELSE goes wrong, it'll be his fault for being distracted by THEIR attacks.
IOW, prepare to live through the Post-Lewinsky Clinton Presidency v2.0.
Edit:
Here's another thing that'll be really neat about how this goes down ... soon, EVERYONE in the USA will be aware that FBI was warned about Tamerlan 'multiple times!!!'. But go around and ask people if they knew that the USA had gotten multiple warnings from a half-dozen country's intel agencies about the imminent attack that turned out to be 9/11 ... and 90% of them will stare at you completely blankly.
We're about to see the effectiveness of the right-wing echo chamber in FULL effect ... frankly, I don't think we should be indulging in more of the same here on DU, but ... to each their own I suppose.