Well, I live here in Orlando and I can honestly say that yes, the rental market for both timeshares and homes is not great.
Not bad, but not great.
I am curious about which timeshare it is, though. I have no problem with detailing what I know (having been here for years and having owned a timeshare here also) but it would be best if I knew the locale.
However, it’s been worse before and may get worse yet. But here is a statistic that will put it all into perspective.
This year, the state of Florida expected an increase of almost 45k students to our state.
We got under 500.
Not 500k, under 500 - total.
Why is that important?
Well, simple. They based that number of expected students on growth rates of previous years and (wait for it, wait for it) the number of homes that were being built/converted.
And now that many (and I mean many) homes that were once apartments are now condos at twice the rent - no one can afford to stay in them. An apartment that was 1k a month is now a 2k condo.
And the houses, well the houses are just about using the same math - about 2x more in rent.
Now for timeshare, this shouldn’t be an issue - you would think.
But now, (for the last year actually) desperate homeowners have gotten smart and will rent their new home for less than people will spend for a small time share.
Big new house, 4 beds, 3.5 baths, pool, new appliances… vs. 900sqft. box on the 13th floor with one bathroom that everyone shares and the elevator is always filled with people and their luggage and at least one kid with dripping pool water that forgot his towel… 
Ah, vacation.
Run the numbers but get some advice too.
Enjoy,