The problem was that HHH never went full heel with them. The booking clearly showed that he was riding the fence with them, and that's why the fans didn't take to it. The fans didn't ruin the heel turn, the banana nosed idiot ruined it.
They were beating up Rey Mysterio. That's a heel turn. The crowd kept cheering for them & it was either fight the crowd on it or just turn them face again but then you have to figure out what group on SmackDown they were going to work with & it wasn't going to be the Bloodline heading into Mania season.
They started teasing the group in July, showed up laying out heels & faces but still getting cheered talking about taking over through August, attacking LWO in September & into October to turn heel while still getting cheered, & by the time November came around they were moving them back towards being faces.
The only heel groups for them to work with were Bloodline who were busy heading into Mania season, the new Legado that was working with the LWO, & Final Testament who wasn't even a thing for another month & change.
We got a Saudi Show with Logan Paul and LA Knight....we could've had a great program against Bobby...we got Kerion Kross
I mean yeah they could have ran Roman vs Lashley at some point I guess just to do it. But even these examples are a year apart & don't really work. LA Knight worked Roman the same Crown Jewel they did Lashley vs Lesnar & Lashley was on Raw during that time. Lashley had just come back after 4 months out & started the group with the Profits when Logan worked Roman, Lashley didn't even work Crown Jewel last year.