Well, every other vaccine has taken years to create. Be it for flu, polio, whatever.
I'm no expert, but usually with something like a vaccine you're talking anything from four to six years of academic and in-lab research. Then there's three to five years of trials, including closely-monitored small-numbers human trials, then it usually takes a few years to gain regulatory approval after the process of independent scrutiny and investigation.
I know "technology" and all that, but if a vaccine hits shelves within a year or so of this virus becoming "a thing" I'd have to believe that some of the above-mentioned steps have been overlooked in favour of being first to provide the world with the answer.
This is like a pharmaceutical space-race of sorts. And it seems America is doing all it can to be first yet again, no matter what it takes.
So yeah, I'll be giving it a wide berth. I'd rather take my chances with a virus like Covid than run the risk of being part of a live testing phase for some quickly put-together answer to the pandemic.