They'll never get a majority, plus what are there other policies? and unless PR is introduced it'll dilute the pro brexit vote, it's doubtful the conservative party will get in with them to form a majority either.
On the flip side the remain vote it split too, with lib Dems gaining some ground and labour losing support (Corbyn at least).
Those calling for a general election better remember to take nothing for granted and to use their vote wisely.
A no in commons (if the brexit party get any seats) because you want no deal is as strong as a no because you want a better one or to remain, basically (possibly), having the opposite effect of what the name suggests.
I get Boris's deal isn't great, but no deal will never get voted through parliament and no prime minister is going to be able to boycott the parliamentary process, unless there is some genuine loophole to be explored which is unlikely and will probably be filled as soon as it is discovered anyway.
Given the state of British politics at the moment if there were a general election I'd be surprised if we don't come out practically the same as we go in, perhaps minus the support of the dup.