-Profs receive money from several other sources - especially patents and are not reliant on as grants for incomes. As such I don't believe it's a massive issue
-Labs rarely get money from undergrad fees which are already insanely high
-Science at the current scale (at least in my area of biology) would stand to benefit from more grad students, the infrastructure just isn't there. This is ignoring the pyramid scheme that is grad school.
The fact this was in fish doesn't mean we can't use this as the start of a model in humans. While it isn't a 1:1 correlation, zebrafish make good model organisms in part due to their genetic similarities to humans.
There's obviously flaws with model organisms, as the saying goes "mice lie and monkeys exaggerate" but zebrafish are surprisingly good organisms to study human problems.