I worry that the pharmaceutical companies won't have the funding to develop vaccines for new variants of existing diseases (like the yearly Covid-19 and flu var

I worry that the pharmaceutical companies won't have the funding to develop vaccines for new variants of existing diseases (like the yearly Covid-19 and flu variants), or even for "new" diseases (e.g. there's a dog vaccine for Lyme disease, but not one for humans). IIUC (please correct me if I'm wrong), vaccine development is expensive, and relies on government subsidies--which certainly won't be coming from the US in the near future. And even provision of existing vaccines depends on there being a market, where the US has been the most reliable such market--again, correct me if I'm wrong (I'm hoping I am!).