Slowdown in economy could mean slowdown in visitors to WDW, which in turn could mean slowdown in DVC sales. These things happen from time to time and it is not "drastic." Following 9/11, Disney faced a period that one could classify as "drastic" as number of visitors dropped significantly and DVC sales were impacted somewhat, but even then recovery began within nine months to a year. A recession will not be anything near as bad for the travel industry as what happened as a result of 9/11. You might see some better DVC sale incentives although I have doubts you will see anything much better than what exists now which are pretty good in themselves. A decision to raise point price might be put off.
A concern is whether a recession and slowdown in sales could impact the yet-to-confirmed Contemporary Resort Villas. If a recession slows AKV sales, Disney is not going to be anxious to announce CRV too soon and could always choose to nix it as a DVC resort.