In fact it gives Corbyn a great opportunity. Boris will call a snap election.
Fwiw the thinking I believe goes something like this -
Boris wants a clear majority to do whatever it is he intends to do, and in order to do that he has to have the full support of his part - no pro-European dissenters voting against him and splitting the party - which basically stopped May from achieving anything. So he will call a General Election
All 'remain' Conservative MP's will be deselected and replaced by 'Brexit' Conservative candidates instead, thus solving internal Conservative politics playing (which he himself did quite a lot of!).
Next a deal will be struck with Farage whereby his Brexit party will be given a clear run at a number of seats - mainly of course Labour controlled ones, whose constituents voted Brexit at the referendum and the recent EU elections.
After the GE the Conservatives with their newly elected Brexit Party MP allies, will have overwhelming numbers to do exactly as they want and the Labour party under the leadership of a 1970's idealist looney left dinosaur in Jeremy Corbyn will suffer a massive electoral defeat and be put into the political wilderness for years to come in such the same way that Corbyn's looney left predecessor Michael Foot did for the Labour Party in 1983, with his manifesto of left wing proposals (one of which was for a Brexit would you believe?) and was described at the time by one of his Labour Party colleagues (Gerald Kaufman) as 'the longest suicide note in history'.
Labour remained out of power for the next fourteen years.
Seems they've learned absolutely noting in the last 36 years.
At least they have the White Stripes tune to chant to though - Oh Jeremy Corbyn, Oh Jeremy Corbyn...