Is there any data that proves attendances of the lower league clubs would go down? Personally I think it’s bollocks. If someone wants to watch live football they will regardless of what games on tv. Streaming is so easy to access now.
A few years back I checked the data of lower league and non league attendances when the EPL started (with its new sky contract), and they actually went up not down. Note some of these teams had schedules which were played on Sundays same time as Sky games.
My personal opinion is there wouldn't be a measurable impact. TV coverage serves well in the following situations.
Unable to attend due to cost, disability, lack of seats at ground so still offers you a means to see your club play live.
Too lazy to attend, this would also mean you too lazy to attend lower league games.
Lack of anything else on at same time. (wouldn't be the case at 3pm kick offs)
Even if it were deemed to have an impact, the EPL standard KO could be just moved to Sunday 3PM instead.
This policy will be hurting Sky and BT, as most clubs who are not in the big 6, the majority of their games are not aired by Sky/BT, so people go looking for illegal streams. Once they find them, they realise they no longer need their sub.