How do you think a peasant country of 30 million could had held on the most sophisticated country of 80 million!
Actually it was 35 million against 69 in 1939 and Poland wasn't really what you could
call a peasant country. We had good industry and very decent tanks and war planes
(we didn't have enough time to build a sufficient number of them - you have to remember
that Poland regained her independence only 20 years earlier).
I agree that simultaneous pre-emptive strike by French and Polish armies
against Germany in 1936 (as advised by Piłsudski) would help to stabilize
the situation and stop the consequent effects of nazi rise to power.
If you ask what should follow then, I can only say that it would have depended
on German people. If they gave up their lunacy and plans to conquer Europe then
they would achieve what Germany achieved now 20 years earlier, without all the
terrible bloodshed and innocent victims.
If they would persist with their lunatic plans of conquest then the only way would
be to split Germany into 5-6 smaller countries and try to keep them antagonized
against one another by bribes and political manipulation.
Personally, I would prefer the former scenario.