Any idea how many or what percentage of the maintenance staff was let go?
WDW has not closed a significant number of resorts, attractions, etc. since 2009. The maintenance needs should not have significantly changed since then. If anything, they may have increased as the parks age. Cutting back on maintenance staff could have a significant impact on overall operations. Not immediately but over time as routine maintenance schedules are lengthened.
Think of it this way. You are supposed to change your car's oil once every 4000 miles. You decide that you don't want to spend the money on this and instead change your car's oil once every 8000 miles. Short term you probably won't notice a difference. However, long term you may be paying big bucks for your short-sighted decision, as well as suffering the added inconvenience of your car breaking down.
Corporations (or governments if you care to look at the slowly decaying U.S. road system) often syphon money from maintenance budgets for other pet projects. Short term, this rarely has consequences. However, long-term the consequences can be dire.
If WDW significantly reduced maintenance staff, then this will have a long-term effect on operations.