This becomes a conversation every year. And you're correct. The worst NFL team would beat the best college team like a college team would beat a JV highschool team. It's not close. Of all the leaps, the leap from college to pro is easily the biggest. Almost everyone on the team was an absolute star of their college and high school teams. Yes, some people blossom later or are in bad situations and thus don't get scouted or drafted and they walk on etc etc. But most of them, if they were held a year or two behind or in a different situation, would have been the star of the team.
It's kinda reminds me of the men's vs women's tennis argument from years ago. There used to be a lot chatter about how the best women could stack up to men. I mean, the women got a LOT stronger in the 90's and 00's and eyeball test says it's possible, right? That was until the Williams sisters, who were ranked as the top women, said they could beat any man ranked lower than 200. They played the 203rd ranked man and he beat them in succession 6-1, 6-2. And it wasn't even as close as that would make it seem. Point being.. it looks like a top tier college team could challenge an NFL team. Um, actually no.