You know, as sick as it sounds, I'd love to see a reboot of the original Mighty Morphin' Power Rangers.
Well, it already was a reboot of Zyuranger
And of all the PR incarnations, MMPR had the shallowest, lamest storytelling and the most effective and charismatic cast. So I don't see any value in redoing the premise of those seasons with a different cast. It would be preserving the weak part without the strong part.
Besides, it's not like the Sentai/PR shows are lacking in formulaic qualities. To a large extent, it's the same thing over and over, just with different actors, different designs, and different execution. So I don't see how a "reboot" of any single PR incarnation would have any advantages over just moving on to adapt the next Sentai season like they've been doing for 17 years already.