It's possible that the whole world could be vaccinated by Johnson and Johnson because it is a single dose and doesn't have to be frozen like Pfizer and Moderna

Yes. That is possible simply because it is both a single dose and it doesn't need to be frozen at such a cold temperature and can be stored safely in any refrigerator instead and is a single dose of vaccine. This might be the way to go actually in trying to vaccinate the whole world especially in 3rd world nations.

The Johnson and Johnson vaccine is not the MRNA which is really high tech. Instead it is the traditional type of vaccine where they give you a little version of the illness instead like they have with flu shots for years and years now. But, flu shots were never usually more than 63% effective in preventing the flu but I have noticed whenever I had a flu shot I never got the flu that year at all. So, what I'm saying is even if a Johnson and Johnson was only 65% or so effective it will effectively save the lives of billions here on earth if and when they got a Johnson and Johnson vaccination. Merck is also helping Johnson and Johnson crank out many many millions of doses right now because Johnson and Johnson didn't have the capacity to crank out as many doses as they thought so the War Powers Act was invoked by Biden to have Merck help Johnson and Johnson do this.