Ok, probably that's Djokovic main concern, as the vaccine might had a side-effect to them as players. I don't think though that scientist are rushing though, no timeline is given, might take like 12-18 months to have a fully working vaccine. Force or not, it is going to be a difficult decision, not just for Djokovic, but everyone who wanted to continue playing without any vaccination. And I think this debate regarding vaccination will continue to go.
As I say in my previous post here Djokovic sometimes is negatively influenced by his wife (who sometimes acts like an idiot, it's my personal opinion). But it seems some of his statement was wrongly interpreted. He is strictly against untested and unproven vaccine against Covid19, he is not against if it is really a solution for this problem. It takes quite a long time for a new vaccine to be fully tested and proven as working.