I also don’t think it can be three weeks, but it’s not going to be eighteen months in my view either,
I think the scientists will find a successful treatment well before then, as in they will do so in the coming weeks, they are nearly there now and trialling over twenty treatments on humans globally and sharing the info, scientists and pharmaceutical companies are also tweaking the “recipe” of some of these existing drugs, as well as mixing them, to make them more effective against it, and trialling those tweaked and mixed drugs, based on their success findings.
For me I think this really is all about the scientists and what they can achieve and how quickly. And we stay locked down till they do achieve it. They are nearly there, and definitely having some success.
A vaccine is much further off.
I think with one of the many successful trials they will start using these drugs to widely treat people very very soon, but continue to evolve and improve those drugs as they are doing so.