The odd part is that if you read the Shannon thread, people are convinced there is a Dublin conspiracy against Shannon. It must be some organisation to conspire both in favour of Shannon and against it simultaneously.
If we're all realistic about it, the loss of the KLM 777 was not a big deal compared to getting a single extra frequency a week on an existing route.
The GA business looks like a screw up entirely of the making of the management at Cork Airport. If the restrictions are excessive, management should be lobbying the IAA and relevant politicians/government departments. If they're not (and I won't make assumptions either way), they should have been planning round them years ago.
Even now, they could easily lease a portion of the airfield for GA business to another operator. They get the landing fees and the lease income, but don't have to worry about capital expenditure. And the extra income would be a nice boost.
Of course, that assumes there's a profit to be made from the GA business, and maybe there isn't, which would explain the lack of activity on that front.