Can't see that at all. You don't just stumble into becoming as huge as Hogan was because Vince McMahon puts you in that role. Hogan was big wherever he went. As for Reigns being able to replicate Austin there is just no chance. Austin made his own push due to charisma that Reigns could never match and promos that Reigns could never hope to deliver.
Make no mistake guys like Hogan and Austin were solid on the mic but the thing to keep in mind is that Hogan in particular used a lot of baseline material i.e: 26 inch pythons, "Whatcha gonna do...", brother every other words, vitamins and prayers, "All the little Hulksters" etc while Austin had "What?" "EH EH!" "And that's the bottom line cuz Stone Cold said so" "can of whoop ass" and any "3:16" references that he used. But he could deliver borderline great stuff mic because he had the liberty to say whatever he wanted whenever he wanted. Hogan on the other hand lived in a day where could talk about saving Donald Trump and all the Hulkamaniacs from drowning by putting them on his back and swimming to safety. A lot of what he had to say was already put on a tee for him.
Meanwhile Austin's day had a liberty we will never... .EVVVAAARRRRR see again. A line like "I brought a little sign language to help you out" while delivering a middle finger or "You call yourself the Gorilla but all you do is hee haw around here like a jackass" isn't some transcendent novelty on the mic. Any of us could think of those things but we don't hear them because we live in a day where the stuff that came out of Austin's mouth is no longer kosher with WWE management but it would still bring down the house.
Roman struggles because he's expected to deliver new, organic material without any baseline material to fall back on. The Rock might've been the most transcendent talent on the mic in history but he still had "If you smell with the Rock is cookin" and the "Stick it straight up your candy ass" line. And yet the moment we realize Roman goes off script he starts doing a little better.
And as for booking... beating up the monster heel of the day or beating up your boss, drinking beer and driving loud vehicles into the arena are the most pleasing things fans can experience. It's not a wonder that Austin remains the most popular icon in WWE history but yet it's no surprise he got the longest leash above ANYONE in history. And to make one last remark about mic work. Guys like Cena, Jericho, Rock and Punk are the most transcendent mic workers in history.
Austin and Hogan are nothing compared to them but none of those guys who rocked the mic had even a fraction of the booking Austin and Hogan did.