If Hall hadn't given the Beatles instruments Vox would have had an opening before Epstein's death.
How do you figure that? Before they exploded, even in the UK, Lennon had already picked up on, and was happy with, a short scale Rickenbacker guitar, inspired by a European harmonica idol of his, Toots Theilemans, who doubled on one. George was enamored of Gretsch guitars, due to his admiration of country and rockabilly players. The unusual sight of a foreign band, let alone a phenomenon like the Beatles, using Rics certainly spurred the company to seize the day and ply them with instruments, with George especially getting onboard with the 12-string(inspiring Roger McGuinn). But by late ‘65 or so, the Rics fell by the wayside in favor of primarily Epiphone, with Paul using his Ric only in the studio for the longest time. Vox instruments, which were not that well made, held little appeal to them, they just used the amps(and organ).
If you take a survey of some of the other British bands of the time, while they may have initially appeared with Phantoms, Teardrops, and the like, those disappeared pretty quickly when they were able to afford/aquire American instruments. Wyman hung in there with his bass, which was a signature model, but he would still trade off with the Framus until he settled on the Mustang for a while. While Brian Jones put the Teardrop on the map, he was using all sorts of other stuff as well.