I'm pretty sure you would be hard-pressed to find anyone in Cleveland who could care less about this latest passing. However, it would be very narrow-minded on their part if they did. Here is a case where a guy probably did more good for the League than he did for his own team.
Before the Ravens even existed, Art had made a name for himself as the owner of the then Cleveland Browns. More infamously as the man who made the hugely unpopular decision to move the team from Cleveland to Baltimore. The franchise had been a staple in that city for decades and he uprooted them in the name of more revenue.
I'm not going to lie, I could definitely see how Cleveland fans could have a visceral dislike for Modell. It's not like there was much else going on in that town. Their two pro teams (the other one being the Indians, but who cares since it's baseball?) were about the only shining light they had in that town. It wouldn't be a whole lot different if someone were to do the same thing to my Chiefs. It would suck, but I would understand.
But Modell played a big part in other things that were tremendously beneficial to the NFL. He helped negotiate the League's first national television contract with CBS back in 192. That would later evolve into the negotiations that led to the development of "Monday Night Football". I defy you to find an NFL fan who isn't glad that came to be.
In addition to negotiating the first collective-bargaining agreement in 1968, he also helped develop the NFL's revenue-sharing system. That ended up being one of the biggest reasons for the league's success and popularity since it helps teams in smaller media markets compete with those in big cities. It's rather ironic that it didn't seem to benefit his team before he moved them from Cleaveland; however, that sure wasn't the case when he got them to Baltimore as the Ravens would go on to be 2000 Super Bowl Champions.
So love him or hate him (Cleaveland), the NFL needed someone like Art. Rest in peace, Mr. Modell.