His majority is on a knife edge and just a few defections will mean he has no power.
See above, he (+DUP) has a majority of 1; as of August 1st the chances are that he'll have no majority at all (polling gives the LibDem a 15% lead).
Of course, this is assuming that the independent ex-conservatives vote against the government, which is likely but not guaranteed.
As of lunchtime today, Boris will have a "workable" majority of 1 (assuming no immediate resignations); which will most likely be down to 0 by the time they get back from holiday.
Q1: How many Tory MPs will resign the whip within 24 hours of Boris being announced? So before recess and the chance to kick-start a GE straight away - there's time post-recess, but barely, I also suspect that minds are made up on that in advance.
Q2: Are there any independents that Boris could negotiate with to support the government? most are ex-labour and ex-conservative, so I doubt it, but there may be 1-2 out there.
Q3: What happens if Boris can't commant a majority in parliament? Can he try his hand at minority governing (and can we imagine many worse candidates for doing so?) Or does he have to go to the queen and tell her that he can't build a government, and call a GE?
Q4: When Boris tries to deny reality and try a minority government - how long before someone else calls for a vote of no-confidence and force a GE?
Q5: How do potential Tory defections (whether to LibDem or independent, can't see CHUK getting any) change the maths? How about if they're big names.
Obviously, a GE doesn't solve anything, and will necessitate a grand-coalition of some description, probably involving 3 parties (Con + BnP + DUP could probably exist, albeit only in nightmares; but Lab + LibDem + SNP would slmost certainly require Corbyn's resignation)