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Would it be ok to give up the Leaping Pool for Hover and Fly?
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Uhh, no, no, and I think... no.
First, there are many -fly powers. Gravity holds and immobs, Snow Storm, Impale, etc.
Second, Fly is much slower than SJ or SS...and if your team is separated, you want to be able to get from one to the other fast. Also, if you need to get away, SJ will get you away much faster than Fly.
Third, since jumping is not a straight line movement, no one will be able to melee you if you're moving. It's too hard to match your constantly-shifting trajectory. But flying (and SS) are straight line movements. Someone can easily catch up to you for some major melee damage.
Fourth, Fly is much more end costly than SJ.
Fifth, CJ and Acro give you mez protection. At best, Fly/Hover has some KB protection, but if you get hit by a -fly, you lose that protection. A stormie would eat you up.. Snow Storm you out of the sky, then knock you around while you were too slow to get away.
As a travel power, fly has some advantages. But as a support toon, in a PvP area, it does not compare to jumping.