Next season, we will be getting 53k fans every week. What's more, to this day, only 4 clubs have won the league as many times as we have. We have also had more seasons in the top-flight (123) than any other club.
What Brian Clough did there was akin to what Ranieri did at Leicester, only much more impressive of course. But does it make them an enormous club? Possibly not.
Imagine Fulham being taken on by a brilliant maverick of a manager and winning the league and the European Cup over the course of a few years. Would that make them a bigger club than us? Of course not.