Hi,
If vaccines offered good protection (like 99.9%+ chance of not getting the disease after being vaccinated) then you could be safe being a "hot house flower" with that technology. But take for instance the seasonal flu vaccine, it is quite often the wrong one or ineffective, so if you rely on vaccines you are in trouble if your body isn't strong enough to fight off the disease on its own currently. So the best thing to do is build immunity naturally, and that is done with a good diet, moderate stress and fighting diseases on your own (when you are strong enough) If you become weak then you can put your faith in vaccines as a last resort if you see no hope to get strong naturally! I would really not like to have received vaccinations my whole life and never fought off a disease and then when I am old and weak get a virus that demolishes my hot house flower immunity. If the immune system is good enough you really reduce your chances of getting infected and needing to develop a specific immune response. Vaccines make the assumption that your immune front line defenses are weak and that specific antibodies are going to be required, a really healthy immune system can keep a disease outside of that.
cheers, Jamie