I'm not so sure tbh. The good/better weather may be better to attend in, but it also leads to more competition imo, from non football activities (such as family days out and holidays, farm work, GAA etc etc). iirc the pattern of attendances has been to drop for the summer, and then pick up again in the Autumn. If it was fickle fans and optimism getting dashed, there wouldn't be the recovery at the end of the season - as the season goes on more supporters/ clubs see nothing left to play for.
There needs to be proper analysis of attendees to try and establish the facts. It may be the summer season has no impact, or maybe it does, but no other change should be made (like the switch to summer was done) on a whim and guesses.
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