It is a fairly obvious game plan now from BoJo - maximise no deal / tough stance rhetoric in order to position for a GE. He is talking tough on preventing HoC stopping him but in reality he absolutely wants them to step in and stop him. In that scenario his campaign message is simple - HoC defied will of the people and only Tory gets you brexit. What happens after a GE (i don't think he has planned it as he has no where to go).
As for the GE. Tories are hugely unpopular, as are Labour - it's all about split votes and holding seats with smaller vote shares. I can only envisage that Tories and Labour will both lose seats to the BXP and Lib Dems. The issue i see is the tories losing most - they are banking on the northern leave towns voting tory - they wont, those people are traditionally labour and will prefer the bxp over tory - they just are not BoJo people. Tory still come 3rd in most of those i would think and the bxp will not get more than 20ish. On the other hand labour and tory stand to lose at least 50~60 to lib dems in the south and tories will get wiped out in scotland to Lib Dem / SNP. Both big net losses for Tory/Labour and crucially I dont think the BXP will off set the tory losses to get a brexit majority. The bottom line is that no deal brexit is just not as popular as the tory strategists think - and the areas where it are do not align with any record of tory success.