Icare,
I think it is 10k cabin, 15k checked, but size restrictions aren't so tough on checked bags.
If an Airline (not just FR) follows this path then the Revenue earning opportunities for an Airport effectively vanish other than Landing charges, fuelling and some desk rental........that should give some Airport operators sleepless nights.
Most people will still park their car at the airport, and there's always the retail / catering - I think MOL just wants to get his finger in these tills.