Well, in short, the DIS Resorts board has had stories for the last year or so of people unhappy with Mousekeeping. Late cleaning, doing a poor job, etc. So Disney was giving people credit/free room nights to pacify them. Now they've opted to offer bypassing Mousekeeping with a credit of $10 (of course you can probably still get towels, etc.). That means fewer rooms to clean for the housekeepers they have.
With all the tourism, hotels, and competition for labor in Central FL, it's hard to get enough good housekeepers who will work for whatever is the prevailing wage. We stayed offsite just outside Disney Springs about 2 weeks ago and we had great housekeepers and I thought about this issue.