When it comes to the question of theme park financing and relationship to makes; take with some heart that this really only applies to smaller single/chain parks. Here in America, there is a lot of focus on directing funds to small business owners, such as grant funding to meet payroll and anticipated future injections of funding to get businesses back up and running - for which many small chain operators would be elligible.
For larger park chains, they're publicly traded, and have a variety of financing options (hence the reason they began selling stocks in the first place), and face no real threat outside of stunted growth for the next 1-2 years.