Suppose no 25th Amendment, what would happen in 1976?

[True Federalist (진정한 연방 주의자)]

Ernest, in your previous post, you state

"the 1947 act has provisions that practically assure that should we ever need a temporary Acting President at a time when no Vice President was available to fill the role, no sane Speaker or President pro tem will resign his current post to take the temporary post"

Do you know what these provisions are, and why they practically assure that no Speaker or President pro tem would resign their posts to become  President? 

Note my choice of words "Acting President".  Suppose that in 1981, a couple of days before Reagan was shot, Vice President Bush died from an unexpected heart attack, while all else remains the same.  Do you really think Tip O'Neill or Strom Thurmond would give up their power and position in Congress just to be Acting President for a few hours instead of Al Haig?  While Haig was roundly criticised at the time, he was correct.  Until Bush showed up or O'Neill or Thurmond resigned, Haig was in control there.

I do agree that in the event that given the opportunity to become President instead of Acting President, the Speaker would almost certainly accept.

[Lincoln Republican]

Ernest, in your previous post, you state

"the 1947 act has provisions that practically assure that should we ever need a temporary Acting President at a time when no Vice President was available to fill the role, no sane Speaker or President pro tem will resign his current post to take the temporary post"

Do you know what these provisions are, and why they practically assure that no Speaker or President pro tem would resign their posts to become  President? 

Note my choice of words "Acting President".  Suppose that in 1981, a couple of days before Reagan was shot, Vice President Bush died from an unexpected heart attack, while all else remains the same.  Do you really think Tip O'Neill or Strom Thurmond would give up their power and position in Congress just to be Acting President for a few hours instead of Al Haig?  While Haig was roundly criticised at the time, he was correct.  Until Bush showed up or O'Neill or Thurmond resigned, Haig was in control there.

I do agree that in the event that given the opportunity to become President instead of Acting President, the Speaker would almost certainly accept.

OK, makes sense what you say.  No way the Speaker or PPT give up their positions under those circumstances, to become "Acting President," until Reagan regains consciousness.

Of course, it would be an entirely different situation if, as you say, Bush died from a heart attack two days before Reagan was shot, and then Reagan dies two days later as a result of the assassins bullet.  In this case, O'Neill I'm sure resigns as Speaker and assumes the Presidency.