This is a very common topic on here. Almost daily it seems. It is just hard to get ADRs -- period. We didn't get any for our 11/15-11/21 trip. Zero. Only thing that was available was Mama Melrose and I was not going to go for that. LOL!
We ended up getting almost every place we wanted other than Toppolino's thanks to Alert sites like Touring Plans, the mouse dining sites, etc. Most of them popped up the week of our trip and some were actually the day before. So don't worry. Sign up for alerts. Toppolino's was a tough one and we even stayed next door to Riviera. We tried hard for that one but didn't get it. Was happy to snag Oga's, Be Our Guest, Sci-Fi, and some others thanks to the alerts.