I would expect it to be effective, and I agree that its development is probably the only way the global economy can start to recover; spending is going to stall while there is risk of infection regardless of regulations. The problem is that it takes years to develop and roll out vaccines. This one in particular should take a bit less time on average considering the gravity of the situation, but we might still need to brace for a multiple-year wait. In the meantime, most people will continue to spend only when necessary.
I am not pessimistic in nature, but I do not like the current situation where governments only focus the public on the current situation and generally avoid talking about the long-term consequences. I am not just talking about an economy that has been hit hard, but also about people who are social by its very nature. Living in isolation for months is difficult, and I know it best because I spent my childhood in the basements hiding from those who invaded my country and bombed it with all possible weapons, so this home isolation is not too much of a problem for me. What I'm saying (and also from personal experience) is that everything that happens will have psychological effects on people, the old way of life has to change.
Reading the various economic analyzes, it is concluded that many countries have actually calculated when and how they will carry out the lockdown, because the goal was for everyone to have a shorter duration of that period. All of that for the purpose that national economy is destroyed as little as possible, because if you close hair salons, restaurants, all the shops (except food shops), schools, colleges, public transport, literally you cut the branch you're sitting on. That's why all countries are in a hurry to get back to normal - but of course with a lot of restrictions that should ensure that the virus spreads as little as possible.
The economic cost of the Covid-19 pandemic can be proxied by GDP forgone, namely the difference between current forecasts and pre-Covid-19 outlook (dashed lines in Graph 1). Under the baseline scenario, annual output loss ranges between 5 and 9% of pre-Covid-19 estimates for the US, and between 4 and 4.5% for the global economy. In worse scenarios, these costs could reach 11% for the US and 8% for the global economy. The latest IMF (2020) forecasts released on 14 April already inch towards these scenarios, with US and global output losses in 2020 projected at 8% and 6% respectively. These costs are an order of magnitude higher than the estimated costs of previous epidemics, and exceed those during the Great Financial Crisis in 2008–09 – when OECD countries on average lost 3% of GDP per year. There are also possible long-term damages from a prolonged economic shutdown, harder to quantify but potentially significant. Bankrupt firms will make no output contribution after containment is lifted, and could disrupt supply chains of surviving firms. Unemployed workers could lose skills and long-term relationships with firms which are costly and take time to re-establish. Hardship and demoralisation could in turn have an impact on labour productivity. Experiences from past recessions suggest that these scars on the economic fabric can be deep and persistent