You think that quantum computers are not able to justify grants or PhDs? What world are you living in?
until these quantum computers exist and are cheap enough to fill datacentres
Yeah, because classical computers were never useful to anyone (or anyone important) until datacenters existed.
No, to be really useful, quantum computing has to be as easy to afford and deploy as current computing technology.
And until then, developments that bring us closer are irrelevant? Applications that could give us more reason to develop the technology are pointless?
What exactly is your point here?