If all the different crypto projects were more coordinated and united this could be achieved soon or at least each month the whole crypto could have some positive progress.
You're going to need a more concrete example, both with the problem you want worked on with the amount of progress to be expected.
Bitcoin's most pressing problems at the moment, for example, are scalability and adoption. It's almost completely incompatible (either ideologically or technologically) with the scaling solutions other projects have taken (and vice versa), so I don't see how coordination could help on that end. It would be great if everyone could get together to promote crypto usage, but at the end of the day, everybody's already doing this, just each on their own time.
I suppose it would be nice to have some sort of united crypto front, but I honestly don't see how that's possible (properly, at least), or how it would even help.