Do you think Boris will either resign or be sacked as PM?Watch
1) Buys time for the media to mnove on and the clouds to dissipate
2) It is not a real review, certainly not independent, as opposed to a nothing report with the thin veneer of accountability. It will exculpate him and all the others, this i have no doubt about.
Only when knows the Conservative Party has had enough of him, he's had enough of No10 and completed all the arrangements that will provide him with sources of significant income lined up for the next 25+ years.
Perhaps he'll wait a few years before resigning? That way the public would have forgotten about the recent scandals (assuming there aren't any more) and he could spin it as, 'I got Brexit done, blah blah, so now I am handing over to someone else to lead the nation'.
Or Tory MPs will vote him out in a vote of no confidence, who knows?