The funny thing is that I also was sold on a Switch due to Ridley being announced (that and "Everyone is Here!"). I never owned the Wii U (I did get Smash 4 on the 3DS since that was a console I owned), and the Wii (which I bought at launch in 2006) was the most recent home console I owned. I was not planning on getting the Switch since I am increasingly a retro and portable game player (the Switch is technically portable, but most of the software I would buy for handhelds would be less than $40).
Ridley's announcement (and the announcement of Ultimate in general with everyone returning as well as all the returning stages) was a game changer, and literally sold a system to me. Ridley is not just a game seller, he is a system seller! I actually picked up several games for the Switch prior to Ultimate (Super Mario Odyssey, Captain Toad, and Sonic Mania Plus).
Playing as Ridley in Smash Bros. is something I dreamed about for nearly 20 years, and it is still a bit surreal that it has finally come to pass, especially after how hopeless things seemed after November 2014. I am glad to see that I am not the only one that was sold on a Switch due to the "big" announcement that happened back in June. Everyone is here + over 100 stages + Ridley + K. Rool + lots of Castlevania content really made Ultimate deserving of its name.