I thought the H1N1 vaccine was available in 2009, in 7 months. Not saying that this will follow the same path, but what is the 5-10 years number based on?
I think H1N1 was very similar to previous viruses. I remember how elders weren’t that effected by it. Just googled and found some stuff like this: Old People May Be Immune to Swine Flu
Study explains immunity to H1N1 in older people
A vaccine has historically taken 10-15 years to produce (Hur forskar man fram vacciner? | Vaccinportalen). The season flu usually goes around the globe and mutates along the way and for the new mutation you can usually alter existing vaccines a little bit and produce a new vaccine fast.
Ultimatley, I have understood that creating a vaccine is a very “mechanical” process. They produce the sample vaccine, test it, gets signals of things that must be altered, there is really no blue print on how something shall be fixed, so they often just guess at something, genetically makes that altercation, test it again, and so forth and so forth. Many vaccine projects, that many 100+ millions have been put into, are just scrapped eventually. They could never get it to work.
Remember that there still is no vaccine for HIV for example. They say that HIV changes so fast that they never have been able to nail something that works. Covid19 is supposedly very stable.
The big X factor from my POV in this case is how much the process can be affected by the tremendous ungraspable amount of resources put into finding a vaccine for this virus fast.