Lots of people. Atheists, materialists, antireligionists, scientists....and many others I expect.
No one wants their world view or their beliefs to be suddenly proven wrong. Memes!! They will do anything to survive.
Scientists in particular will have plenty to lose if an after-life is proved. It'll suddenly give life a meaning and direction....horror of horrors!! What will happen to all the random variations, emergent properties, coincidental cosmic occurrences and so on?!! Generations of carefully cultivated materialism will....poof... vanish.
People will once again have to believe in God or gods...and purpose...and morality....and sin ...and penance....and discipline....and sacrifice and duty etc.
What do you mean 'who' has a vested interest in dismissing an after-life?!
Ah, I see what you mean. I rather think the 'vested interests', and 'meme' jibes suit people who follow religious beliefs rather than those who do not. It is science, not religion, that maintains at its heart the notion that all knowledge is provisional, and many scientists dream of overturning the current paradigm a la Einstein and perhaps picking up a Nobel prize in the process. It is science, not religion, that concerns itself with how things
actually are, and
actually work, rather than how we would like to think they are, and has consequently built into itself a high bar of integrity through a culture of testing and attention to detail. Religions on the other hand are more concerned with ways of living and thinking that suit people in a particular cultural context; the epestemic truth of religious claims are not their main driver, more important is their ability to balance and comfort the mind on a day to day basis.