Its my personal opinion, that Hindenburg after his reelection 1932 willfull destroyed the Republic and betrayed the people who voted for him.
Yes, that is absolutely true. But he and his entourage completely miscalculated the situation and ended up with a situation they didn't really want. It is not as if January '33 was going by plan, but was simply an intrigue-fest driven by vanities and ambitions.
Still, in the time between 1925 and 1932, I think, he stabilized the Republic.
Yes, but every decent president would have had a stabilizing role post-1925. The period was virtually self-stabilizing after the upheavals of 1918-1924.
You are right about the Reichswehr never starting a coup against Hindenburg, but during this period of time, I do not see that danger very much (actually not even later, because as long as the political militias are so numerous and the Reichswehr so restricted that they are not guaranteed to be the dominating faction in what might lead to civil war, the risk would always be deemed too high).
So its possible we will have an even strnger opposition from the Right against the Republic and a takeover from Hitler as President in 1932 looks quite realsitic.
That is the danger I would be really afraid of. One more year of Hitler.
The election results of 1932 make it seem probable that Hindenburg kept a few right wingers on his side which had some disgust over Hitler but were nationalists or very conservative. I am anything but sure if these voter would have supported a SPD or Zentrum-candidate. If Stresemann had lived, that might have been a different situation.
Though- you never know how they Nazis might screw up if confronted with the nadir of the Depression instead of sailing on the breezes of global economical recovery.
I assume though, that Hitler as president would make the whole "Gleichschaltung" even easier as he could select a Reichskanzler to his liking and so the NSDAP would have both offices in their hands in no time.