I haven't heard "likely," I've heard late this year/early next is the hopeful possible best case - and that would be literally unprecedented. But maybe I missed it. And again, even if an effective vaccine is developed,
- that doesn't mean anyone and everyone will be able to get one, could take months (health care workers and some others will be ahead of the general population),
- the threshold for success (according to PBS NewHour) is effective with at least 50% of patients, and
- no one has any idea how long it will be effective, could be a year, longer, or mere months.
Those who are banking on a vaccine likely have a long wait ahead.
I don't know about "banking" on a vaccine, but I think there is reason for optimism.
In March, Fauci was saying it would take
at least 12-18 months to have an approved vaccine. Now 4 months later, here are a few of his recent statements:
https://abc7news.com/dr-fauci-mark-...hen-will-there-be-a-for-covid-19-and/6321008/
"Beginning of 2021, we may have a vaccine candidate that is actually safe and effective."
https://www.nbcnews.com/health/heal...ine-we-will-least-have-answer-winter-n1233024
"we hope that by end of this year, or the beginning of 2021 we will at least have an answer whether the vaccine or vaccines - plural - are safe and effective,"
I'm quoting what I think is his most pointed statement in each interview but feel free to read the rest of the articles. The point is, while Fauci isn't offering any certainties, he suggests plausible time frames which are much better than what he was saying was the best possible time frame only a few months ago.
There is also good news about other areas mentioned by Midpack, including effectiveness and manufacturing / distribution. For instance:
On effectiveness:
https://www.bbc.com/news/uk-53469839
The Oxford vaccine "study showed 90% of people [1077 people were in the trial] developed neutralising antibodies after one dose. Only ten people were given two doses and all of them produced neutralising antibodies."
On manufacturing/distribution: The U.S. just bought 100 million doses of one vaccine:
https://www.usnews.com/news/health-...-for-100-million-doses-of-coronavirus-vaccine
"They expect to manufacture up to 100 million doses of the vaccine by the end of the year and more than 1.3 billion doses by the end of 2021."
My impression from other stories like this is, as the months go by we seem to be getting better and better news about vaccine progress/testing. Not something to "bank" on, but reason for optimism. As Fauci says, by the end of the year, we should at least know whether the vaccines currently undergoing trials work ("are safe and effective") or not.
From a personal perspective: I'm healthy and in my late 50s - not in the highest risk group but in a medium-risk group. Last year I did about 16 weeks of traveling. I had planned to do that much this year, but so far I've put nearly all travel on hold. Another 5 months (i.e. until the end of this year) isn't that long to wait to find out how this round of vaccine trials pans out. If we find out by the beginning of 2021 that a fairly effective vaccine exists, great. If it takes a few more months for effective distribution, I can wait for that too. Even if a vaccine isn't 100% effective, I'll take what I can get. A 75-80% effective vaccine will give me a lot more confidence about resuming traveling.
If on the other hand we get to the first of next year and all the vaccine candidates that have trials this year are deemed ineffective, and by next year it seems that we are no closer to an effective vaccine than we are this year, I'm not sure exactly what I'll do but I will be very hesitant about traveling (and other group activities). What I think now is, I'll still want to get back to a little bit of traveling but not anywhere near as much as I would have planned; I will try to avoid sightseeing that is likely to be crowded; etc.