Let's say UK with her dominions and France didn't declared war when Germany invaded Poland. Do you think the Western front of WW2 would have been none existing and Hitler would only focus on the USSR and the Eastern front?

Or would he eventually brought UK and France in too the war anyway because "muh versailles treaty"?

From what I understand Hitler and his Germany only wanted to be at war with the filhty Bolsheviks, at least in the beginning. UK, France and rest of world wasn't that interesting but he knew they were going to declare war once he attacked Poland. But if they didn't, could the WW2 have been avoided?