I would never remove a current feature. But I would totally consider adding this as an alternative via new FSD technology.
What sort of speed would be talking about though?
It has to be gravity well based just like super cruise is now and hence scale with local system density.
In a system dense area such as the core, you'd be slower - which allows actually getting to the next system instead of overshooting things all the time.
In a system sparse area you would travel much faster, not wasting time going through mostly empty space.
It would open up reaching distant clusters with fuel tank filled ships or straight up stranding yourself in the void.
(imagine a fuel rat rescue, where two ships have to go half the distance, with one refuelling the other before turning back to fetch more fuel for the final return trip of the customer and rescue ship)
The most fun about this to me would be the idea of dodging systems, since I'd assume that proximity to a system would make you drop into it (giant gravity well).
So if you make a long trip, prepare to steer around many glowing dots.
Travel could in fact be
a lot faster, since you don't really have to load any systems en route while in hypercruise (pass one every two seconds?). Although reentry would still have to load a system as usual (I doubt streaming system data with so many possible destinations is feasible), which should be fine if the arrival sequence has the appropriate animation (little different from a hyperjump).
I would probably make ships using this technology drop in at the edge of a system rather than the star (like an exclusion zone).
Identifying scoopable stars in hypercruise and then deciding when and where to drop for refuel could be a delicate challenge, since you then still have to super cruise to the star.
Knowing your fuel stops in advance (multi star system configurations being visible as they already are when selected) would be of importance.
What would different grades of this technology and ship weight do, with flat range not being a factor? Fuel efficiency I guess.
A grade or a light ship will get you further on one ton of fuel than E grade or a heavy ship.
Speed remains unaffected for usability among different scales (same as super cruise).
A super charge from a jet cone would probably further increase fuel efficiency as well until you refuel again.
So charging up from one in supercruise as usual will allow you to travel further in hypercruise.