Why not? The OT still exists and can be watched in multiple formats. But, even Lucas was dissatisfied with it. The PT feels out of step with the OT and the exploration of the period between the PT and the OT is only going to highlight this more. And it's OK to reboot.
Possible controversial opinion time but I have expected a reboot since the PT happened. The PT feels much differently than the OT and not just because of design language. The characters talk differently, the galaxy looks differently, people treat things differently than in the OT. All of the assumptions fans made over the years are now up for grabs.
I get that the OT is seminal in terms of being iconic for fans, iconic for filmmaking, and a landmark of cultural significance but that doesn't make it above a reboot.