^Sometimes I wish someone would just take a bulldozer, go over every non-Disney building (Convention Center included), so that Disney could have SPACE.
Either way, I do remember those signs from my childhood, and it is a bummer to see them get taken down, but I don't think it's going to translate into a negative guest experience.
They may not notice the hotel off the bat, but I'm sure the new sign will be up shortly. Now, from reading this thread, I wasn't able to guess anything, but are they going to put up a new sign? If so, I don't know why they wouldn't maintain the original font. Does Anaheim's sign code prohibit that font?