Dora (and similar shows) actually affected much of the show today: for one thing, Sesame Workshop had a turn-over in staff recently, with some people coming from Viacom, which always took a far more corporate approach in handling things, which is what's been going on SS in recent years (one of the things that rubbed Joey the wrong way). You'll notice Dora has a small cast of core characters, as do many other pre-school shows these days, which is one of the reasons why the cast of SS in terms of both humans and Muppets has been drastically reduced in recent years.