Definitely not. If you had enough volume to fill a spoon, around 15 mL, it would be 30-60 times greater than your typical injected vaccine. Some individuals might have a slight immune reaction (think upset stomach, body aches, etc) to its viral fraction, but those people would likely have a similar reaction to the same vaccine being injected. Many people wouldn't notice anything at all.

Almost certainly not.

Pretty much certainly yes. Within 100-120 years.