Despite a lack of support towards the microphone, Nintendo will still carry it.
Despite news of several retailers no longer carrying the device, Nintendo will still be fulfilling retail orders for the Wii Speak microphone.
Recently, Conduit 2 developer High Voltage Software confirmed that Nintendo told them to not use the peripheral for their online chat features in favor of PDP's Headbanger Headset. It hasn't been confirmed, however, if the title will still support WiiSpeak for those that still use it.
Titles such as Nintendo's Animal Crossing: City Folk and Endless Ocean 2, as well as Capcom's Monster Hunter Tri use Wii Speak. The new headset will not work on past Wii Speak titles.